Emilie: added functions to remesh a volume

Classification editor detects all closed or open curves

  the .msh format -> bumped version from 2.0 to 2.1)
- move createTopologyFromMSH into GModel.cpp (and renamed to
  createTopologyFromMesh)

Added cell combining methods (about O(n^2)) to further reduce the size of
the cell complex before applying Smith normal form computation.

(Don't know why there seems to be some benchmarks/ files modified too,
Somebody else committed between my update and commit?)

added createtopologyFromMSH to create Topology from list of triangles

Fixed error in line curvatures

about O(n^2) -> O(n*log(n)).

The bottleneck is now in the Smith normal form computation of the reduced
cell complexes, O(n^3).

- uniformize syntax for parFromPoint/XYZtoU (cf. versions in GFace)
- fix compile

Added ability to compute the "scalar potential cuts" for homology
generators using coreduction. Modified utils/misc/celldriver.cpp to
demonstrate this.

Added some more or less useful utility and experimental functions.
Numerious bug fixes.

added createTopology when Merging a MSH File and implemented discreteEdge