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- more work on slepc integration

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

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

* rewrite femTerm in terms of SElement

renamed most gmsh* classes

started to create parallel topology in the mesh

- pretty print code

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)