- since version 0.4
	* added libutempter support
	* changed utmp to utmpx for better compatibility
	* fixed a bug of core dump when dragging to under the window
	* fixed bugs of (un)drawing cursor
	* fixed automake/autoconf related bugs
	* fixed bugs of fribidi layout driver for IA-64 system
- since version 0.3
	* added utmp support
	* fixed a bug that doesn't scroll properly when using scrollbar
	* fixed a bug of selection that multi width characters are not 
	selected properly
	* fixed a bug that selection of highlighted text doesn't inverse
	* deleted VTScreenView_update_rect
- since version 0.2
	* added CHA(ESC [ G) Cursor Character Absolute escape sequence
	* fixed a bug of HPA mapping (ESC [ G -> ESC [ `)
	* added CHT(ESC [ I) Cursor Forward Tabulation escape sequence
	* fixed a bug that TAB(^I) doesn't wrap properly
	* added CNL(ESC [ E) Cursor Next Line escape sequence
	* added CPL(ESC [ F) Cursor Preceding Line escape sequence
	* re-implemented screen_row.c to reduce memory consumption
- since version 0.1
	* changed thread model to event dispatch model
	* added ECH(ESC [ X): Erase Character escape sequence
	* added HPA(ESC [ G): Character Position Absolute escape sequence
	* added CBT(ESC [ Z): Cursor Backward Character escape sequence
	* added VPA(ESC [ d): Line Position Absolute escape sequence
	* changed tty_termila_io_<name> to TtyTerminalIO_<name>
	* added TtyTerminalIO_get_associated_fd() method
	* changed enable PLS library is default
	* added Splash Text
	* fixed a bug that fribidi layout doesn't work on some locales
	* added alternate buffer & cursor(ESC [ ? 1049 h/l) escape sequences
	
	
