simpler tetgen integration by Jozef Vesely

Merged patch from Matt Gundry <mjgundry@faa-engineers.com> to support
the structured Plot3d mesh format.

removed extra white space and node coord format in UNV export

Adding python solver interface from Carl Osterwisch <osterwischc@asme.org>.

The interface comes with a example python "solver" that converts an Abacus
result file (in CSV format) into Gmsh post-processing views. Very cool ;-)
Thanks Carl!

copyright update

- Replaced the general eigenvalue solver with a version from Laurent's
MatLib code (a bit more stable thanks to floating point checks with
adjustable tolerance)

- Added a solver for symmetric matrices (again from Laurent. Thanks, dude!)

- Added a small driver for 3x3 matrices, that selects the appropriate
solver (sym/nonsym) automatically

contrib

2 small mods for T. Schumacher

new solver options: SocketCommand and NameCommand (patch by
<C.Stott@surrey.ac.uk>)

add contributors

Merged Netgen 4.3.1: a Delaunay/Frontal 2D/3D mesh generator.

Thanks a lot to Nicolas Tardieu for this!

- %.1g -> %g to display bounding boxes
- update credits

1.53 release

And more airplane work!

- merged STL patch from Nicolas Tardieu. This patch permits to
  create an real elementary surface for each STL face. Until
  we have some code to directly remesh the STL data (which would
  be much nicer and cheaper), this is very useful. We can finally
  use STL representations to create meshable volume models.
  Thanks Nicolas !

- new option to color the mesh by physical entities (if an element
  belongs to multiple physicals, we use the first one)

- additional cleanup of the mesh drawing code

- big cleanup of the geometry creation section in the parser:

  * removed horrible Geo/DataBase.cpp
  * fixed all List-related memory leaks (a lot!)
  * added tests to check if we don't try to recreate existing
    entities (this should prevent many weird bugs due to incorrect
    input files)

- fixed LineLoop/EdgeLoop memory leaks

- many small fixes all over the place

More "airplane" work...

- rewrote the way we handle lights: glEnable(GL_LIGHTING) is now used
  at the lowest level, where it belongs. This fixes many lighting
  glitches, and should make the whole stuff much more predictable;

- simplified the display modes for geometry and mesh: the choice
  between wireframe/solid is now independent of the choice of
  lighting/no lighting (and there is a new "Enable lighting" option
  for the geometry, too--even if it does only affect things like
  normals/tangents at the moment);

- brand new code to draw really nice (shaded) 3D arrows + 3 options
  that fully parameterize them (they can degenerate into pyramids,
  cones, w/ or w/o stems, etc.);

- new options so that we can also use the new arrows outside the
  post-processing module (e.g. for tangents/normals).

- "alt+d" now simply switches between solid and wireframe mode;

- new shortcut "alt+w" to switch the lighting mode for all the modules
  (geo/mesh + all post views) at once.

Update copyright notice

Remove licensing information

Add missing license for gif and ppm code

Removed clickable e-mails

1.45.2

Rename CONTRIBUTORS into CREDITS and comply more accurately with the
advertising clauses of the SGI and Berkeley licenses.