Add the option to prevent using metrics for high-order mesh generation (useful for some matched OCC models atm)

Adds an option to switch elementary and physical tags in loaded meshes, and fixes a bug with geo-mesh matching.

fixed newton in DG

* basic Abaqus INP mesh export

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in GUI to avoid flood of messages on mailing list (thx to Dave for this)

optimizing 3D meshes without also optimizing 2D meshes with Lloyd

introduced mesh.optimizeLloyd to fix this

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prototype "-watch" option to watch for specific files according to 
a pattern (use 'w' shortcut in GUI to test)

Added Navier Stokes & 2 test cases in DG
Added binary restart capabilities in DG
Added mesh renumbering option (-renumber)@

Added possibility to save distance to all boundaries (gmsh box.geo -2 -distance writes an additional distance.pos file)
distance is computed simply with ann for the moment

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

better gestion of remote messages ("a la getdp")

added some more topological infos in high order elements (useful for DGM,
still have to be tested)

- 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.