fixing  orientation of adaptive triangles and quads

better heuristics for vertex array allocation (to get less horrible
performance on cygwin; the correct fix would be to do a preprocessing
step to precompute the actual number of primitives that are going to
be drawn... or even better: stop using cygwin alltogether)

ask confirmation to overwrite a mesh file when clicking on "Save Mesh"

call fl_register_images() explicitly (don't rely on loading the default
icons to initialize the extra image handlers)

Disable the End_Curve/End_Surface tests after point transformations
if Geometry.AutoCoherence=0. This is not perfect, but at least this
gives us a way to bypass these (very slow) tests for big models with
a lot of geometrical transformations (for which one would set
AutoCoherence to 0 anyway)

I borked the smooth plugin with my cleanups: this fixes it

move yy globals into Gmsh.l

remove obsolete BGM structure

removing dead code

better export mesh as post-pro view

remesh in script

polish

new "Background Mesh" command

removed the STEP parser: it's unusable, it makes the parser bigger,
and it introduces conflicts in the syntax.

- better fallback when outside the octree
- disable bgm when optimizing in netgen

Rewrote the background mesh code to use the new post-pro octree instead
of the old brick stuff. It's 100x faster ;-)

make the bgmesh work with quads

shorter view title

set bg gradient by default

- complete file type list
- call Fl_File_Icon::load_system_icons() in the GUI ctor so we have all
  the nice icons and the image preview in the file browser

show stat pane that is appropriate for the current context (instead
of always the mesh stat)

more secure usage of expr

- if FLTK provides the image libraries, use them (and don't test by ourselves)
- added new (fltk-based) image reader routines for JPEG, PNG and BMP

y off by one

better averaging

typo