update less often for small meshes

Added progress message while reading .msh files (idea from Nicolas)

Instead of popping up a progress bar, I just used a Msg() call. Not
sure which is best, but this is a bit simpler..

removed extra white space and node coord format in UNV export

remove debug printf call

allow negative line loop number in surface definitions

re-introduced the ability to reverse the progression in 1D transfinite meshes
by specifying a negative line number (not sure why we removed this...)

- removed all the crappy STL code and rewrote it using JF's POLY_rep
  class

- generalized POLY_rep so that we can use the polygonal discretization
  as a surface mesh, and mesh in 3D afterwards. I.e., we can now take
  an input triangulation (a single surface in STL format, multiple
  surfaces in STL format, one or more surfaces defined using the new
  "Discrete Surface" commands), and generate a 3D mesh that uses it. We
  could in theory even mix triangulated and "normal" surfaces in the
  same geometry, but nothing is done at the moment to ensure that the
  mesh at the interfaces would match (if it does, it actually works
  very nicely)

- new STL mesh output format to export a surface mesh as a STL file

- added an option to the GEO output routine to save the surface mesh
  as discrete surfaces associated with the geometrical surfaces

- added STL and Text output formats for post-processing views (the
  text output allows for example to exploit plugin-generated data in
  gnuplot)

- generalized Plugin(Evaluate):

  * can loop automatically over all the timestep and/or components

  * can do operations using data from an external view

     - if the 2 views are based on the same grid, the plugin does the
       evaluation very efficiently

     - if the 2 views are based on differenet grids, the plugin
       automatically interpolates the external view data onto the
       grid of the current view

- added new Rand() function in MathEval

- default colormap is now # 2 (the Matlab "Jet" colormap)

copyright update

optimize ExportLc

test if there is anything to save before opening the file

generalized ExportLcField to all element types

prevent crash when no contour

- reworked the keyboard shortcuts with Laurent (our very own Macintosh
  Usability Guidelines Expert)

- new smoothing option for jpeg output

- new small GUI dialogs for ps/pdf/jpeg/gif/msh output (makes the
  'format' menu in the file dialog much shorter)

forgot to add a copy of the simpl pointer in the global simplex tree

- fix cast in a couple of error msg
- more fixes in elliptic algorithm (surf->TrsfVertices and surf->Vertices
  were incomplete)

fix+cleanup elliptic algorithm (didn't work when line mesh orientation was
opposite of original generatrice)

fix copy/paste bug in error message when quad/pyramids already exists

upgrade to Netgen 4.4

- moved the AdaptiveView stuff in its own header file

- fixed small bug in IsoSimplex (when Raise != 0)

- fixed small memory leak in Plugin/Extract (when one or more
  expressions are invalid)

This patch fixes an old design flaw in the post-processing module,
namely that we used a list of Post_View objects instead of a list of
pointers to Post_View objects in CTX.post.list.

This had many annoying consequences, in particular the fact that we
needed to be extra careful every time the list was reallocated (as
pointers to the list elements would become invalid).

I tried very hard to change the code everywhere it should be changed,
but I might have missed something. Please let me know if you see
anything suspicious (like a crash when you duplicate/remove/combine/...
post-processing views).

make Export_LcField also work with SimplexBase

The "Simplex" class is now derived from a new class "SimplexBase",
which contains only pointers to the nodes, and none of the other stuff
necessary for the actual mesh generation.

All the input/output/display routines have been rewritten in terms of
SimplexBase: this provides a gain of almost 50% in memory when you
just load meshes from .msh files to do visualization stuff, instead of
actually generating the mesh.

New "fast" routine to create simplices used only for
visualization. This speeds up the load time of large tetrahedral
(volume) meshes by roughly 50%, and brings Read_Mesh.cpp pretty close
to mshsort.cpp performance-wise. Since Read_Mesh does many more things
(all the Tree/List queries to create elementary/physical entites +
partitions), this is actually pretty good.

Loading a 1.4 million tets mesh file on my 1.5 GHz Linux machine now
takes about 17 seconds.

cleanup (and remove 2 shift/reduce conflicts in parser)

Fixed bug in second order mesh of closed curves

add error check in Oriente()

proof of concept for unproject (e.g. to add points with the mouse)

256 -> sizeof(string)

Don't call Mesh_Quality() in GetStatistics()

added vertex arrays in volumes to store the boundary of the cuts
when we draw them "as surfaces" (for Philou, not tested yet)

make depend

- fixed a couple of gcc warnings + added missing o->end() in
  jf's StructuralSolver plugin

- fixed the view option code: FLTK > 1.1.5rc1 breaks our use of
  widget->changed()...

- added background mesh support in the aniso algorithm

- added Orientation() members for hexas, prisms and pyramids

- use det3x3() instead of ad-hoc code everywhere it makes sense

make depend

- moved the smooth normals stuff into a separate file
- added smooth normal support for surface meshes (very nice!)

add an area constraint on the elements in the initial mesh to make
the refinement nicer