Major changes:
  - integ_mesh is computed only on fully damaged support,
  - comp_mesh adds new vertices and edges inside the fully damaged zone and then erase useless entities,
  - the code is almost 3D,
  - algorithm part of the code moved to TLSAlgorithm, in order to share it with DamageBand, DamageBandDyn...

Minor changes:
  - small improvement of Export,
  - get rid of every xIter except in TLSGeom so that if someone wants
  to use other kind of iterators (that deref in mEntity*),
  - dispatch code in several different files.

TODO:
  - remove the TODO spread in the code (boring),
  - finish the cut of tetrahedra in Cutter,
  - clean deletion of mEntity* after adpating comp_mesh (I forgot to do this => memory leaks),
  - get rid of mEntity* (is it even possible?).




git-svn-id: https://svn.ec-nantes.fr/eXlibris/Applis/TLSDuctile@2261 fbbead7c-fb4d-4173-aa67-51132c73c120