simplified vertex array logic

removed couple of old optimizations we don't need anymore

removed the locks: I'll re-add them if I actually see a problem...

- generalized vertex array class to use reallocatable arrays

- introduced vertex arrays in post for all triangles: this speeds
  things up tremendously for ALL scalar views: 2d scalar views of
  course, but also for 3d isos (tets, hexas, etc.) and all smooth
  normals. The costly computations (compute the isos, get the normals)
  are only done ONCE each time the view is changed. Then we just pass
  the vertex array to OpenGL everytime we need to redraw (e.g. when we
  rotate the scene)

- removed the display list code alltogether: it's completely blown
  away by the new vertex array code!

for the record: with the new drawing code, you can

- rotate 500,000 triangles in real time on a 3-year old linux PC
(tested with a boing 747 surface mesh from CU: 10 times faster than
old code)

- display and rotate in real time 10 transparent+smooth shaded 3D isos
for a 1 million tet mesh (about 1 frame per second with the new code;
took tens of seconds with the old one)

Awesome :-)

move norme() at the right place

update doc for vertex arrays

since we store the colors in the vertex array, we need to mark the
mesh as changed when we change the colors

use GL_NORMAL_RESIZE instead of GL_NORMALIZE: it's faster

- added experimental support for vertex arrays in the mesh drawing code
(only for triangles at the moment). This speeds up the drawing of large
meshes tremendously!

- removed support for mesh display lists

- fixed + documented 2d elliptic algorithm
- renamed transfinite files

Added 27th node for 2nd order hexahedra

added documentation for 2nd order elements + renamed some Draw_Mesh_XXX
functions

move the compareEdgePtr function in Edge.cpp

- added some progress info during the 2nd order mesh generation (so that
  the interface does not freeze for too long)

- cosmetic changes to some other progress messages

Added final bit for 2nd order elements: the middle face nodes for
quadrangular faces (i.e., for quadrangles, hexahedra, prisms and
pyramids).

fix test in copy_mesh(surf, surf)

document edge ordering for hexa, prism and pyramid

- removed the quads from the simplex trees (finally...)

  **warning**

  this is a pretty big patch that touches a lot of different files. I
  tried my best to update all the things that needed to be updated,
  but I probably forgot some things... Please test! (especially the
  export routines in obscure formats like SMS, Gref, etc., as well as
  the extrusion code)

- added second order edge vertices for hexas, prisms and pyramids
  (drawing not done yet)

- added sanity check for number of values in post-pro parsed file
  format

- merged all mesh printing/reading routines in Print_Mesh.cpp and
  Read_Mesh.cpp

- cleaned up the statistics code

make parser

Small changes inspired by Wednesday's discussions:

- added FL::check in redraw_opengl() (and thus removed DrawUI()):
  this should (?) fix the missing redraws

- protected the orientation calculation with a lock

- made the mode selection widget do its callback even if we don't
  change the selection (so that we always go back to the top-level
  menu)

Small changes inspired by Wednesday's discussions:

- Mac only: Gmsh now publishes its "file types"... That means that
  geo/msh/pos files now have nice icons, and that you can double-click
  on a geo/msh/pos file in the Finder to open it :-)

- removed support for fltk 1.0 (wasn't compiling anymore anyway)

- doubled the timout in GmshServer (2->4s): this seems to help on
  Windows (thanks to jkools@veeco.com)

- added warnings in the docs about the Attractor feature

- increased WB by 1 pixel in the GUI

- replaced more Msg(FATAL) with Msg(ERROR) where it makes sense

missed these bits in my commit yesterday

refined the messages a little bit more, so that only valid choices are
displayed at any time. (This is wicked cool, man :-)

PS: this is probably my last commit for quite a while (in case you
wondered: I have to do a demo of gmsh tomorrow, hence all my work
the last couple of weeks...)

rewrote the contour extraction routines from scratch: one can now
select the entities in arbitrary order, and undo all the steps
interactively.

add missing list_rest in select surface/volume

add sanity check in List_Pop

- merged ONSCREEN1 and ONSCREEN2 to minimize redraws

- fixed s->Orientations test

fine-tune transformation message

- fixed race condition in surface drawing
- plugged s->Orientations memory leak
- improved "select hole" message

display the interactive messages in the graphic window (instead of the
status bar)

- added "undo" capability in geometry creation interfaces

- removed all ugly statics in Geo.cpp

- fixed a couple of bugs (recompute min/max and surf->orientations)
  after we apply geometrical transformations