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

No commit message

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

No commit message

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.