start work on mesh>edit feature (delete elements, etc.)

Only 2D elements have been tested

declares default __gnu_cxx::hash_map

use for_each like Real Men(tm) do

prepare for extrusion

fix SIZE64 configure test (assume32 bits by default)

better mousewheel algo

zoom using mousewheel

new GModel::writeGEO (only implemented for gmshModel for now; goal is to be able
to implement this for other derived model types (like OCC) later, too)

trying to fix problem with new cygwin (it defines min/max macros???)

- patch from gabriele bellussi
- added GUI hooks for new mesh editing/reparam stuff (for jacob)
- more work on fourieModel

- stores sorted order of vertex addresses
- added Equal, Less, and Hash function objects for MFace and MFace*

- added Equal, Less, and Hash function objects for MEdge and MEdge*

use MVertex::distance + better check in writePOS

spec fltk theme with -theme + minor tweaks

fix button drawing "problem" (labels get "fat" with antialiased fonts). Tip from mike@easysw.com.

fix namespace clashes with CGNS headers (patch from sguzik@utias.utoronto.ca)

- second order nodes on geometry by default
- better min/max range computation for cut planes
- more work on fourierModel

force orientation of mesh to match the orientation of the geometry

keep existing vertex numbers when reading meshes (when it makes sense)

fix missing SIGN in NR

read vertex indices separated by blanks or commas in vrml (both seem to be correct)

- added CROD in BDF
- also accept small "e" and "d" in BDF floating point numbers

added Shewchuk's robust geometrical predicates (since they can be duplicated in
Tetgen/triangle I've put them in the gmsh namespace)

small fix for neg phys