better quad meshing

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Remeshing multiple patches (eg capot.geo) ok for all 2D meshers (added check normals for all patches)

Mesh.RemeshParametrization=1; //(0) harmonic (1) conformal 
Mesh.RemeshAlgorithm=1; //(0) nosplit (1) automatic (2) split metis
!!! This replaces old parser stuff such as Compound Surface()={} Harmonic_NoSplit;
!!! Default values are harmonic and automatic
TODO: change this in FLTK/optionWindow.cpp

* new option to recombine all tri meshes, whatever the specific setting for a given surface
* libmatch -> libblossom (there's a libMatch.dylib in the default MacOS install)

2d meshing algo with -optimize does lloyd optim (tri or quad optim algo depending if recombine is selected)

- invert #define logic (HAVE_MESH, HAVE_POST, HAVE_SOLVER, ... instead of HAVE_NO_MESH,
  HAVE_NO_POST, HAVE_NO_SOLVER)

never ever change the immutable vertex numbers: otherwise we cannot use
our algorithms from outside with prescribed boundary meshes

-> use MVertex::_index instead

(renamed setNum to forceNum to make sure we don't use setNum by mistake)

- 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

moment; we need to change the actual algorithm to ensure that we create
correctly oriented triangles in the first place)

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

fix recombine with embedded edges

multi-window & multi-coordinate system drawing.

There's no new functionality for now: PLEASE TEST THAT EVERYTHING
WORKS AS IT USED TO BEFORE.

consolidate parametricCoordinates with reparamMeshVertexOnFace