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renamed most gmsh* classes

make divide & conquer thread-safe by encapsulating everything into the DocRecord class

- 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

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

   1) this removes the asymmetry in all the routines involving mesh
      elements associated with points

   2) it makes it possible to use point-based datasets in the
      model-based post-processing module

  **********************************************************
    PLEASE TEST --- ESPECIALLY THE INPUT/OUTPUT ROUTINES!
  **********************************************************

* made GModel::getEntities() more efficient and generalized its use

- merge OCC64 patch from Jose Paulo Moitinho de Almeida

* removed unused stuff (more to come)
* moved remaining into Common

  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

untabify

* more work on gmodel post-pro
* small cleanups in divide and conquer: reduce memory by removing unused
  voronoi, fix potential crashes in meshGFace, introduce basic class dealing
  with allocations to avoid messy malloc/free

start reducing header pollution (removed Gmsh.h + cleaned up GModel & co)

- reimplemented subdivision of extruded meshes
- fix indent + unused var + gcc warnings all over the place

new option to compute char lengths from curvature + removed most unused mesh options

curvature control is ok
divide and conquer algo has been cleaned up

reduce POINT memory footprint (remove all unused stuff!)

bidir db: phase 3 -- move all the old geo stuff into Geo/