Save the chosen FLTK theme in the per-session resources

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

Make it possible to change Triangle options

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.

Added warning + option for circle/ellipse arcs >= Pi

Corrections apres relecture / part 1

More work on chapters 1 and 2. Should be mostly OK now.

Major rewrite of the Overview section + web page

Added "gmsh -doc" to automatically generate the texinfo documentaion
for all the options.

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

Fix whitespace in copyright headers

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

Fixed a couple of typos + copyright dates

bump version to 1.37.0: system calls on Windows are now correctly implemented using the CreateProcess Windows API

Updated copyright

Enable occlusion culling by default

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

Fix typos + set default jpeg quality to 100

doc update

update tutorial.html + unnamed -> untitled

Save more window positions + polish previous commit (restore defaults)

Add ability to draw lines as 3D cylinders. Looks very nice with our
stream lines :-)

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

Added an option to set the number of subdivisions used when drawing
spheres (when geometry, mesh or post-processing points are drawn as 3D
spheres). You can test with:

gmsh tutorial/t5.geo -string "Geometry.PointType=1; Geometry.PointSize=8; General.SphereSubdivisions=10;"

Change default post-processing iso mode to continuous map. The old default value just confused too many people doing 3D stuff.