Open pdf files in binary mode

- Fix pb with index returned by Extrude Surface
- Upgrade gl2ps

- Comment JF's last changes in the parser until we fix the syntax

- Update gl2ps

- Small fix in the configure script to better detect fltk-config

- Fix Parser/Makefile (for older versions of bison)

Fix feedback buffer size for tex output

New native PDF support

One more warning

Fixed a couple more warnings + added AppleMenuBar option

fix (?) missing lines pb

fix USE_CURRENT_VIEWPORT

Update gl2ps with new occlusion culling improvements from Shahzad.

Cosmetic changes

Add DisplacementFactor option + rename ArrowScale->ArrowSize and
ArrowType->VectorType

Some morer work on second order elements

Fix a couple of bugs for 2nd order elements. Seems to work OK for 2D
meshes now. 3D is still kinda flaky, and extrusion is not implemented.

update to 0.9.1

gl2ps update (fixes the detection of smooth/flat shaded polygons in
"mixed" scenes)

Speed up variable creation/retrieval by replacing 'List_T *Symbols_L'
by 'Tree_T *Symbols_T'.

cleanup vonmises (a bit)

Von Mises value displayed.

Fixed a couple of gcc warnings

remove unused vars and fix compile with old versions of libpng

small fix so that gmsh still compiles with fltk 1.0

depend

fix copyrights

Added PNG support

better comment

Implement GUI for rotation center

Better glOrtho arguments. Check benchmarks/misc/faraway/

New option to specify the interactive rotation center (default is now
the center of gravity, instead of 0,0,0)

small cleanup

clip=10 should be enough

Better (?) fix

temp fix of clipping planes so that we can zoom in more

Fix whitespace in copyright headers

Add missing copyright headers

Remove dead code