Unfortunately I did not check the import/export capabilities of Gmsh
before I started to complete the implementation... oh well!
The new implementation is quite similar to the GMV one. IANACPPG,
therefore I highly appreciate your comments and criticisms.
Here some highlights:
o Import of *.msh files, version 1 and 2
o Export of *.msh files, version 2
o Export of all Elements is supported, except for QUAD8, PRISM15 and
HEX20, which have no counterpart in Gmsh (what should we do here?)
o Import of all Elements is supported except for the Pyramid, that are
not implemented in Libmesh
Maybe I will find the time to implement exporting of solution vectors.