2008-02-13  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile (nk.rwb): Delete existing nk.rwb and locks.

2008-02-08  Aubrey Jaffer  <agj@alum.mit.edu>

	* opticompute.scm (extract-parameter): Added slib:error calls for
	unrecognized operators.

2008-02-03  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile (pinstall): Create absolute-path usercat in
	libfreesnelldir.

2008-02-01  Aubrey Jaffer  <jaffer@aubrey.jaffer>

	* Makefile (VERSION): Bumped from 1b6 to 1b7.

	* index.html (x86 MS-Windows Installation): Now has MS-Windows
	installer.

2008-01-31  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile: Always put - between FreeSnell and version.

2008-01-25  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile (mfiles): Added.
	(pinstall): Added usercat; removed FreeSnell.nsi.

	* index.html (FreeSnell Development): Link to freesnell-discuss
	email list.

2008-01-23  Aubrey Jaffer  <agj@alum.mit.edu>

	* index.html (Volunteer opportunities): Added section.

2008-01-24  Aubrey Jaffer  <agj@alum.mit.edu>

	* nk.html, polyethylene.html, coherence.html, dielectric.html,
	granular.html, metallic.html: Replaced HREF="index" by HREF=".".

2008-01-21  Aubrey Jaffer  <agj@alum.mit.edu>

	* FreeSnell.nsi (MainSection, Uninstall): Added CRC nk files.

2008-01-19  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile (install): test -d is not needed with mkdir -p.

2008-01-18  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile (nk.rwb): Depend on nk.scm.
	(infoz): mkdir -p.

	* nk.scm (load-spectrum.nk!): Read non-SOPRA files by line.

	* FreeSnell.texi (Supported nk Formats): Added.

2008-01-17  Aubrey Jaffer  <agj@alum.mit.edu>

	* FreeSnell.nsi (PRODUCT_VERSION): Added "-1" suffix.

	* Makefile (doszip): Do it like Jacal.

	* nk.scm (nk:error): Removed.
	(nki.usage): Force-output to make sure message appears.
	(load-spectrum.nk!): Fail gracefully if first line is bad.

2008-01-16  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile (RSYNC): --rsync-path no longer needed.

	* nk.scm (nk:open-database!): Handle locked or missing databases.
	(add-nk-spectra, del-nk-spectra): use nk:open-database!.

2008-01-15  Aubrey Jaffer  <agj@alum.mit.edu>

	* nk.scm (nk.script): With no argument, run nk-shell.

	* Makefile (tagfiles): Added FreeSnell.nsi.
	(pubfiles, upfiles): Removed FreeSnell.lnk and nk.lnk.

	* FreeSnell.nsi: Fixed CreateShortCuts.

	* nk.scm (nki.usage): Split from nk.usage.

2008-01-13  Aubrey Jaffer  <agj@alum.mit.edu>

	* FreeSnell.nsi: Cleanup desktop and icons on uninstall.

	* Makefile (FreeSnell.html, w32install): Added targets.
	(pinstall pubfiles): Added FreeSnell.nsi.

2008-01-08  Aubrey Jaffer  <agj@alum.mit.edu>

	* FreeSnell_96x64.ps: Added.

	* Makefile (FreeSnell_toc.html): Add icons.
	(images): Added FS96.png and FS.ico.
	(FS96.png, FS.ico): Create from FreeSnell_96x64.ps.

2007-12-31  Aubrey Jaffer  <agj@alum.mit.edu>

	* FreeSnell.texi (Specifying Designs): Links to validation-suite
	pages need .html to avoid contention with .scm files.

2007-12-20  Aubrey Jaffer  <agj@alum.mit.edu>

	* index.html (Running): Corrected directory path.

2007-12-17  Aubrey Jaffer  <agj@alum.mit.edu>

	* index.html (x86 MS-Windows Installation): Corrected SCM version.

2007-11-26  Aubrey Jaffer  <agj@alum.mit.edu>

	* nk.scm (graph-spectrum): Fixed for Ghostgum on MS-Windows.

	* index.html (x86 MS-Windows Installation): Added nk.lnk.

	* FreeSnell.texi (Installation): Added nk.lnk.
	(The nk script): Updated plot options.  Described nki.

	* Makefile (upfiles, pubfiles): Added nk.lnk.
	(release): cvs tag the files.

	* nk.scm (nki): Added interactive command mode.
	(graph-spectrum): Use gsview (instead of gv) on MS-Windows.

2007-11-24  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile (VERSION): Bumped from 1b5 to 1b6.

2007-11-23  Aubrey Jaffer  <jaffer@aubrey.jaffer>

	* nk.bat: Can't get "#!" trampoline to work; added this stub.

2007-11-20  Aubrey Jaffer  <agj@alum.mit.edu>

	* nk.html (Sources): Added CVS source links for CRC metal spectra.

2007-09-30  Aubrey Jaffer  <agj@alum.mit.edu>

	* polyethylene.scm (polyeth-35): Added to model
	http://wwwchem.uwimona.edu.jm/spectra/polyeth.jdx.

	* Makefile (images): Added Conley.png polyeth-trns.png
	polyeth-35.png.

	* index.html: Changed DOCTYPE to HTML 4.01 Transitional.

	* nk.html, polyethylene.html, coherence.html, dielectric.html,
	granular.html, metallic.html:
	`imgsize' script added WIDTH and HEIGHT attributes to IMGs.
	Changed DOCTYPE to HTML 4.01 Transitional.

2007-09-17  Aubrey Jaffer  <agj@alum.mit.edu>

	* hdpe.nk: Replaced with measurement-derived values.

	* Makefile (images): Added FTIR-poly-fig-5.png.
	(nk.rwb): Added target.

	* optiplot.scm (trace->dash): Unknown changed to 5 2 from 5 5.

	* polyethylene.scm: Tweaked sizes.

	* polyethylene.html (Background Emissivity): Expanded explanation.

2007-09-07  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile (upfiles): Added nk.scm for upload.

2007-09-04  Aubrey Jaffer  <agj@alum.mit.edu>

	* *: Updated license notices to GPL 3.

	* Makefile (srcdir.mk): Removed.
	(install*): Added $(DESTDIR) prefix.

	* COPYING: Updated to GPL-3.0.

2007-07-08  Aubrey Jaffer  <agj@alum.mit.edu>

	* *.html: Added google-analytics javascript.

2007-06-30  Aubrey Jaffer  <agj@alum.mit.edu>

	* optiplot.scm (write-data-to-file): Write data in requested order.

2007-06-08  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile (FreeSnell.info, temp/FreeSnell): Changed to use "mkdir -p"

2007-05-27  Aubrey Jaffer  <agj@alum.mit.edu>

	* FreeSnell.texi (Optical Stack): Use layer* instead of internal
	substrate.

2007-03-26  Aubrey Jaffer  <agj@alum.mit.edu>

	* nk.html (Sources): Added links to new sources.  Corrected
	`extinction-coefficient'.

	* nk.scm (nk.script): Plotting options now --log-log, --lin-log,
	--log-lin, and --lin-lin.

	* optiplot.scm (trace->dash, plot/wavelength): Corrected behavior
	of extinction-coefficient.

	* opticompute.scm (extract-refractive): Corrected behavior of
	extinction-coefficient.

	* FreeSnell.texi (Traces): Corrected `extinction-coefficient'.

	* granular.scm (al): Use GranFilm's funky Al data if available.

2007-02-19  Aubrey Jaffer  <agj@alum.mit.edu>

	* granular.scm (nobles, transitions): Added.

	* granular.html (Granfilm): Added comparison of Fig. 8.

	* Makefile (images): Added nobles.png and transitions.png.

2007-02-11  Aubrey Jaffer  <agj@alum.mit.edu>

	* nk.scm (plot-nk-spectra, graph-spectrum, array<-complex-table):
	Take log? flag choosing between linear and log-log plots.
	(find-matching): Give warning when command argument is unmatched.

2007-02-03  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile (images): Added hdpe-pas.png.

	* polyethylene.html: Expanded FTIR-PAS text; added hdpe-pas.png.

	* polyethylene.scm (hdpe-pas): Added; fixed size of hdpe-ftir.

2006-12-30  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile (images): hdpe-33ni.png, hdpe-33.png, and
	protected-al45.png were missing.

2006-10-27  Aubrey Jaffer  <agj@alum.mit.edu>

	* metallic.html (Matching Measured Data): Added color-swatches.

	* metallic.scm (hot-mirror-2): Generate color-swatches.

	* Makefile (images): Added AgMgO-3-color.png and ZnS-color.png.
	(images): Added hot-2-color.png.

	* granular.html (The Colors of Zinc Sulfide): Section added.
	(The Colors of Silver and Gold): Compare GranFilm results with
	Rouard's table.

	* granular.scm (ZnS-colors): Added.
	(AgMgO): Generate color-swatch.

	* opticolr.scm (make-colors-swatch): Cross out-of-gamut swatches.

2006-10-21  Aubrey Jaffer  <jaffer@aubrey.jaffer>

	* Makefile (VERSION): Bumped from 1b4 to 1b5.

	* fresneleq.scm (granular-IR): Commented out early definition.

2006-09-21  Aubrey Jaffer  <agj@alum.mit.edu>

	* polyethylene.scm (hdpe-card-absorb): Explicit range.

2006-09-14  Aubrey Jaffer  <agj@alum.mit.edu>

	* opticolr.scm (write-color-table.eps): expt --> real-expt.

	* opticompute.scm (compute/wavelength, compute-IRs/wavelength):
	expt --> real-expt.

	* optiplot.scm (write-data-to-file): expt --> real-expt.

2006-08-27  Aubrey Jaffer  <agj@alum.mit.edu>

	* opticompute.scm (extract-parameter): Use real-ln.

	* fresneleq.scm (Snells-law): Use real functions.

	* opticompute.scm (extract-parameter): Use SCM's real-log10.

	* optiplot.scm (plot-response): Use SCM's real-log10.

	* video.scm (dbize): Use SCM's real-log10.

	* nk.scm (array<-complex-table): Use SCM's real-log10.

	* metallic.scm (hot-mirror-2): Adjust smoothing for video
	filtering of logarithmic abscissa.

2006-08-20  Aubrey Jaffer  <agj@alum.mit.edu>

	* index.html (Installation): Rewrote.

2006-08-19  Aubrey Jaffer  <agj@alum.mit.edu>

	* FreeSnell.texi (Installation): Updated and expanded.

	* Makefile (install): Added target.

	* polyethylene.scm (make-hdpe.nk): Update HDPE from database.

	* index.html (Quick Start for Unix): Use development thread
	FreeSnell.zip.

	* nk.scm (nk-lookup): Handle 2.eV and 400.cm^-1.

2006-08-18  Aubrey Jaffer  <agj@alum.mit.edu>

	* opticolr.scm, optiplot.scm, granular.scm: Changed single quotes
	to double for MS-Windows command-line arguments.

	* index.html: Split Quick-Start sections into Unix and Windows.

	* Makefile (pubfiles): Added FreeSnell.lnk.

2006-08-15  Aubrey Jaffer  <agj@alum.mit.edu>

	* polyethylene.scm (make-hdpe.nk): Don't always recreate
	"hdpe.nk".

2006-08-13  Aubrey Jaffer  <agj@alum.mit.edu>

	* hdpe.nk: Now generated by "polyethylene.scm".

	* polyethylene.scm (HDPE-BE): Separated background-emissivity
	function from interpolated function.
	("hdpe.nk"): Added transition at 3600.cm^-1.

	* dielectric.html: Changed old validation references to
	dielectric.

2006-08-10  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile (dvi, pdf): New tetex-3.0(-20.FC5) broke them -- fixed.

2006-08-04  Aubrey Jaffer  <agj@alum.mit.edu>

	* optiplot.scm (plot-response): Do smooth after l-transform-xs!.

	* coherence.scm (film-flat, film-smooth, film-flat-wn): Added.

	* coherence.html (Gaussian Filtering): Added.

	* Makefile: Added polyethylene* and hdpe-*.

	* dielectric.html, granular.html, index.html, metallic.html:
	Added "Polyethylene" entries.

	* polyethylene.html, polyethylene.scm: Added.

2006-08-01  Aubrey Jaffer  <agj@alum.mit.edu>

	* opticompute.scm (extract-parameter): Added LN and LOG_10.

2006-07-31  Aubrey Jaffer  <agj@alum.mit.edu>

	* nk (load-spectrum.nk!): Added support for /cm and nm formats.

2006-07-30  Aubrey Jaffer  <agj@alum.mit.edu>

	* optiplot.scm (wavelengths): Renamed from `linear'.
	(wavenumbers): Renamed from `wavenumber'.
	(eVs): Renamed from `eV'.

	* FreeSnell.texi (Bibliography): Granfilm URL changed.
	(Ranges and Units): Linear, logarithmic, wavenumber, eV now take
	third and fourth arguments specifying graph abscissa limits; first
	and second arguments specify computed range.

	* optiplot.scm (eV, linear, logarithmic, wavenumber)
	(plot-response): Now take third and fourth arguments specifying
	graph abscissa limits; first and second arguments specify computed
	range.

2006-07-29  Aubrey Jaffer  <agj@alum.mit.edu>

	* optiplot.scm (plot-response): Let wavenumber be wavenumber.

2006-07-23  Aubrey Jaffer  <agj@alum.mit.edu>

	* metallic.scm (hot-mirror-2): Reduced sigma from 0.03 to 0.025.

2006-07-22  Aubrey Jaffer  <agj@alum.mit.edu>

	* FreeSnell.texi (Ranges and Units): Smooth command takes
	argument.

	* metallic.html (Measured Data): Gaussian smoothing improves
	simulation's match to measurements.

	* metallic.scm (hot-mirror-2): Use Gaussian smoothing.

	* optiplot.scm (plot-response): Smooth command changed to convolve
	signals with Gaussian curve.

	* opticompute.scm (compute/wavelength, compute-IRs/wavelength):
	Removed l-trans argument.

	* video.scm (smooth-columns): Now does (parameterized) Gaussian
	smoothing.

2006-07-21  Aubrey Jaffer  <agj@alum.mit.edu>

	* optiplot.scm (plot-response): Do dB conversion after smoothing.

	* opticompute.scm (compute/wavelength, compute/angle): Postpone dB
	conversion (done on whole array).

	* video.scm (dbize-columns!): Added.

2006-07-20  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile (co.png, co96.png): Added targets.
	(scmfiles): Added video.scm

	* opticompute.scm (extract-parameter, extract-refractive): Moved
	dbizing to callers.

	* optiplot.scm (log_10): Use (real-only) $log.

	* usercat: Added video-processing.

	* video.scm: Video processing of spectra.

2006-07-10  Aubrey Jaffer  <agj@alum.mit.edu>

	* opticompute.scm (extract-parameter): Made 'average' work for any
	number of arguments.

	* Makefile (images): Added IRG-II-2.image1.jpg,
	IRG-II-2.image2.jpg, and IRG-II-2.image3.jpg.

	* granular.html: http://web.mit.edu/cmse/www/IRG-II-2.nug02.html
	no longer exists; redirect to web.archive.org and local copies of
	images.

2006-05-22  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile (images): Aded co96.png.

2006-05-15  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile (docs): Added target to make all documentation files;
	then invoke xdvi.

	* FreeSnell.info, FreeSnell.texi: Converted to use @copying.

2006-04-24  Aubrey Jaffer  <agj@alum.mit.edu>

	* FreeSnell.texi (Installing the nk script): Added.

	* Makefile (new): FreeSnell.texi has version number.

2006-03-26  Aubrey Jaffer  <jaffer@aubrey>

	* Makefile (VERSION): Bumped from 1b3 to 1b4.

2006-03-26  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile (hfiles): Added nk.html.
	(pubfiles): Added nk.rwb.

	* nk.html (nk): Extracted from index.html.

2006-02-13  Aubrey Jaffer  <jaffer@aubrey>

	* Makefile (VERSION): Bumped from 1b2 to 1b3.

2006-02-02  Aubrey Jaffer  <agj@alum.mit.edu>

	* optiplot.scm (write-data-to-file): Output x, not log(x).

2005-12-07  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile (scmfiles): valfiles no longer part of.

	* metallic.scm (enhanced-al): Added rest of stacks.

	* index.html: Updated "nk --list" output.

	* mgo.nk: Added from GranFilm Dielectric.tgz.

	* blackbody.nk: Added very absorptive material.

	* optiplot.scm (plot/angle, plot/wavelength): Wrapped columns with
	in-graphic-context so that markers don't get colored.

2005-12-06  Aubrey Jaffer  <agj@alum.mit.edu>

	* nk (add-nk-spectra): Sopra/sicrir.nk and Sopra/sio2ir.nk extend
	the range of sicr.nk (crystalline Si) and sio2.nk respectively.
	(load-spectrum.nk!): Change negative k values to 0 and warn.

	* sio2.nk: Removed; extended Sopra data behaves better.

2005-12-04  Aubrey Jaffer  <agj@alum.mit.edu>

	* optiplot.scm (trace->dash, plot/wavelength):
	(extract-refractive): Added k/n alias for extinction-coefficient.

2005-12-03  Aubrey Jaffer  <agj@alum.mit.edu>

	* granular.scm (AgMgO-ang): Combined with MgO plot.

	* optiplot.scm (plot-response, write-data-to-file, plot/angle)
	(plot/wavelength): Handle multiple optical-stacks.
	(stack-colors): Added trace color per optical-stack.

	* opticompute.scm (compute-IRs/wavelength): Split from
	compute/wavelength.

	* opticolr.scm (make-colors-swatch): Handle multiple stacks.

	* dielectric.scm (fig.2.2): Combined plots.  Added colors.

	* dielectric.html (Anti-Reflection Coatings): Combined plots.

2005-12-01  Aubrey Jaffer  <agj@alum.mit.edu>

	* optiplot.scm (color-swatch): Renamed from color.

2005-11-30  Aubrey Jaffer  <agj@alum.mit.edu>

	* optiplot.scm (plot-response, plot/wavelength): Fixed eV scale.

2005-11-28  Aubrey Jaffer  <agj@alum.mit.edu>

	* optiplot.scm (trace->dash, plot-columns, plot/wavelength): Use
	dashing rather than color to distinguish traces.

2005-11-17  Aubrey Jaffer  <agj@alum.mit.edu>

	* FreeSnell.texi (Ranges and Units): Wavenumber is logarithmic.

	* opticompute.scm (compute/wavelength): l-trans replaces w-trans.

	* optiplot.scm (plot-response): Straightened out conversions and
	logscales.

2005-11-11  Aubrey Jaffer  <agj@alum.mit.edu>

	* fresneleq.scm (squmag): Square of magnitude instead of SQUABS.

	* opticompute.scm (optical-stack, describe-stack): Increased LAYER
	threshold considered as wavelengths from 1/100 to 1/50.

2005-04-29  Aubrey Jaffer  <agj@alum.mit.edu>

	* hdpe.nk: Home brewed infrared nk spectrum for high density
	polyethylene.

2005-04-28  Aubrey Jaffer  <agj@alum.mit.edu>

	* optiplot.scm (output-data): Added command to write file.

2005-04-16  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile (VERSION): Bumped from 1a11 to 1b2.

	* fresneleq.scm (combine-layers): Fixed when top is layer*.

	* optiplot.scm (graph:right-template, graph:left-template): Added.
	(plot-response, font): Handle font info in "font" command, split
	from output-format.
	(plot/angle, plot/wavelength): Call set-margin-templates.

	* FreeSnell.texi (Plots): Split font info out of output-format.

	* coherence.html: Added.

	* coherence.scm (coherence): Added.

2005-04-14  Aubrey Jaffer  <agj@alum.mit.edu>

	* dielectric.scm, granular.scm, metallic.scm: Uncommented calls to
	browse-optics-url; defined browse-optics-url stub.

2005-04-12  Aubrey Jaffer  <agj@alum.mit.edu>

	* index.html (Documentation): Added validation suite tables of
	contents.

	* FreeSnell.texi (Specifying Designs): Updated URLs.

	* dielectric.html: Renamed from "validation.html".

	* dielectric.scm, metallic.scm, granular.scm: Split from
	"tests.scm".

2005-04-05  Aubrey Jaffer  <agj@alum.mit.edu>

	* usercat: Don't assume that directory is named FreeSnell.

2005-01-08  Aubrey Jaffer  <agj@alum.mit.edu>

	* FreeSnell.texi (Optical Stack): Coherence and incoherence.

2004-12-23  Aubrey Jaffer  <agj@alum.mit.edu>

	* fresneleq.scm (combine-layers): Simulate incoherent layers.

2004-11-28  Aubrey Jaffer  <agj@alum.mit.edu>

	* opticompute.scm (layer*): Incoherent layers.

2004-11-24  Aubrey Jaffer  <agj@alum.mit.edu>

	* FreeSnell.texi (Traces)
	* optiplot.scm (incident)
	* opticompute.scm (compute/wavelength): Average over multiple
	incident angles.

2004-11-07  Aubrey Jaffer  <agj@alum.mit.edu>

	* tests.scm (dielectric, metallic, granular): Split (tests).

	* validation.html, metallic.html: Split validation into 3 parts.

	* Makefile (hfiles): Added metallic.html.
	(hot96.png): Added.

	* optiplot.scm (incident): Removed undocumented average-angles
	feature.

	* opticompute.scm (compute/wavelength): Removed undocumented
	average-angles feature.

	* FreeSnell.texi (Optical Stack): Cleaned up about substrates.

	* opticompute.scm (merge-layers): Moved substrate treatment into.

2004-11-06  Aubrey Jaffer  <agj@alum.mit.edu>

	* opticolr.scm (stack->XYZ): Substrate arguments absorbed into
	layers.

	* optiplot.scm (plot-response): Stack is now list of layers.

	* fresneleq.scm (combine-layers): Moved IR_1 to layers.

2004-11-03  Aubrey Jaffer  <agj@alum.mit.edu>

	* fresneleq.scm (combine-layers): Moved IR_n+1 to layers.

	* Makefile (docfiles): Don't include ChangeLog.

2004-11-01  Aubrey Jaffer  <agj@alum.mit.edu>

	* validation.html, tests.scm (metal-bp, dual-bp): Found TiO2, SiO2
	IRs that make graphs match.

2004-10-31  Aubrey Jaffer  <agj@alum.mit.edu>

	* fresneleq.scm (combine-layers): Optimized.

	* tests.scm (polymer-ag, AgMgO-p): Tuned.

	* opticompute.scm (merge-layers): Remove 0-thickness layers.

	* tests.scm (hot-mirror-2): Layer glass, not substrate.

	* optiplot.scm (graph:font): Changed to "Times" for better degree
	symbol
	(graph:font-size): Raised to 13 to compensate font change.

2004-10-30  Aubrey Jaffer  <agj@alum.mit.edu>

	* granular.html (GranFilm): Web graphs don't agree with pdf.  Use
	pdf graphs.

	* Makefile (images): Added GranFilm-*.png from pdf.

	* tests.scm (AgMgO-ang, AgMgO-p): Added more GranFilm graphs.

2004-10-29  Aubrey Jaffer  <agj@alum.mit.edu>

	* Makefile (images): Added AgMgO-sq-th.png AgMgO-p.png AgMgO-s.png
	MgO-ang.png AgMgO-ang.png.

	* opticompute.scm (optical-stack): Do the right thing for
	substrate-only runs.

	* optiplot.scm (plot-response): Don't DESCRIBE-STACK when there is
	no stack.

	* tests.scm (nk, MgO): Dielectric.tgz has MgO.

	* granular.html (GranFilm): Trying to resolve scale issue.

	* optiplot.scm (parameter-color): Added polarized absorptions.

	* opticompute.scm (extract-parameter): Added polarized
	absorptions; added expression-traces.

	* Makefile (AgMgO-hist.png): Added.

	* FreeSnell.texi (Traces): Added polarized absorptions; added
	expression-traces.
