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renamed most gmsh* classes

fix cl comp pb for embedded verts

re-committing work from last two days after server crash:

- refactored old Geo code (new/delete)
- moved DrawPlugin to Plugin
- move from matheval to mathex
- move from Flu_Tree_Browser to Fl_Tree
- fixed crash in Triangulate plugin

- moved GUI to FlGui + added experimental QGui to test Qt

- fixed most MSVC and gcc compiler warnings

- converted some remaining tabs to whitespace (that's why the patch is
  so large; please try to remember to indent with 2 spaces and not
  tabs when you commit stuff to CVS)

- merged modified patch from Konstantinos Poulios to allow saving
  physical/partition as element tags in mesh formats that don't
  support them natively

instead of implementation details (tetgen+delaunay & co)

Removed GSL dependency. Gmsh now uses blas and lapack for linear algebra
stuff.

- fix bb computation to avoid model jumping around when adding points in z=0 plane
- pass interpol matrices as ref

consolidate parametricCoordinates with reparamMeshVertexOnFace

  did in high
* added mesh generation error log summary
* removed Parallel subdir (this is now handled by the message class)
* removed Box subdir and consolidated batch processing in a single
  routine
* made List_T into a class
* reduced dependencies in Pview*.h so we can eventually add the post-pro
  interface to the public API

- replaced "Mesh.ContrainedBackgroundMesh" by "Mesh.CharacteristicLengthFromPoints" and
  "Mesh.CharacteristicLengthExtendFromBoundary"

- fixed MED IO when numComp > 9