Update .gitignore
NEWS: Update.
src/mainfrm.cc,src/mainfrm.h: If full screen, don't recreate the
side panel when a new file is opened (e.g. via Ctrl+O).
lib/,src/avenprcore.cc,src/printwx.cc: Change term "info box" to
"legend".
src/message.c: On Microsoft Windows 2000 and newer, use
GetUserDefaultUILanguage() to get the UI language to use.  For older
versions, continue to use GetUserDefaultLCID().
doc/TODO.htm: Remove things which have now been done, and reorganise
the rest.
lib/survex.pot,src/mainfrm.cc: Allow "m" and "ft" suffixes to be
translated.
lib/Makefile.am,lib/generate-po-todo: Add script and makefile target
to pick out the messages from each po file which need attention.
lib/: More translation updates.