Compilation instructions under unix/linux

- the FLTK library is needed

- optionally, the PDFLib Lite library is used: 
	make 
will use it but 
	make seaviewps 
will not to use it and will create a postscript-producing executable.

- modify the Makefile to reflect locations of FLTK, PDFLib Lite include files and libraries.

- optionally, comment out and customize the HELP_NOT_IN_PATH line in Makefile to set helpfile name at compile-time. If not done, file seaview.help is searched in all directories of the PATH.
