GetStatistics for 2D meshes gives now mean value quality also

* 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)

the status messages that slow down the mac gui

we could try to copy a mesh before generating the source mesh

don't mesh GVertices in the constructor: this has nasty side effects when
loading geos+mesh+new post-processing datasets

-> Mesh0D in Generator

Please test: this change could have unexpected consequences... :-)

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

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Propose to automatically create .geo file with a Merge command when
trying to append a scripting command to a non-geo file. Got the idea 
after the discussion with Robert Bou. (This is better than scripting
the Merge command IMHO.)

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

CreateTopologyFromMesh more accurate
Possibility to partition also Faces and not only GModels

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)

enhence statreport

fix warnings

oops, should not have committed openmp tests with jf

add benchmark/boolean