* clean up unused feature.

it affects:
  - Export.cc
  - Import.cc

* improvement of transfer of displacement field after remeshing

it affects:
  - Formulation.cc

* correct a small bug that happens sometimes in restart, "mean" vectors
had wrong size after restart. It was always too long and filled with NaN.

it affects:
  - FormulationQS.cc

* had several "guards" that end computation and give an error message when
something goes wrong.

it affects:
  - TLSSolver.cc
  - FormulationQS.cc

* correct an error in the getGrad function of CohesiveLinearHardeningFunction

it affects:
  - MaterialFunction.cc

* swap orientation in comp mesh generation. It seems that it is test case dependent.
TO BE INVESTIGATED if your comp_mesh has two colours when plotting in GMSH.

it affects:
  - MeshGeneration.h

* correct a bug resulting from \Gamma_in recent commit. FastMarchingModeExtension
was updating phi based on \Gamma_in. The obtained phi was not anymore corresponding
to the iso-lc discretisation, it leads to damage equal to 1 inside the mechanical domain.
It leads to singular stiffness matrix.

it affects:
  - TLSSolver.cc