Indented all source files using utils/gmshindent

Add some indent directives

Clean up VERSION_FLAGS and OS_FLAGS (use HAVE_FLTK instead of _FLTK,
remove _BLACKBOX, etc.)

Updated copyright

Introduce OpenGL display lists for drawing meshes. Does not seem to
work much faster on my machine, though.

Fix make source

- Cosmetic changes in 'File->Save as' menu
- 'flattened geometry' -> 'unrolled geometry'

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

Intagration of Jonathan Shewchuk's Triangle as an alternative high performance 2D Delaunay algorithm

NOT work: it creates duplicate points, etc.). Sorry!

Menu reorganization
Typosx