One more warning

Fixed a couple more warnings + added AppleMenuBar option

Added PNG support

Fix whitespace in copyright headers

Upgrade to latest gl2ps version

Indented all source files using utils/gmshindent

Updated copyright

New occlusion culling code contributed by the guys from CERN. Disabled
by default.

after CreateOutputFile, preventing consecutive "Print" in the parser
to change format correctly

"save as" stuff. This will only work with fltk > 1.1.0rc4 (Michael
Sweet added 2 functions to the fltk file chooser specially for us!)

Interface polish (buttons should not be resized when the size of the window is changed);
gl2ps update (not finished);

Clean up stringb expressions