MAIN POINTS :
    - As usual in this process of removing raw AOMD tag usage, this
      release remove yet another tag :
    was_created_by_tag(), which is use in lots of place in the library
    to refer to the entity that created the current one when it was cut.
    This commit remove the famous was_created_by_tag and replace it with
    a static DATAMANAGER inside xMesh, accessible via get_was_created_by() and
    get_const_was_created_by()
    Not suprisingly, the produced at first  some error in the test case,
    again due to some data still In the manager while the entity is already
    destroyed.
    The following point solved this issue.
    -cleaning process of xMesh and an entity of the xmesh is improved.
    In particular we rewrite the override of mMesh::del(AOMD::mEntity *)
    in xMesh, to make sure it actually cleaned all the data related to the
    entity that are owned by xMesh.
    A clear() member function is also defined that empty the mesh
    and all the Data related to it.
   - In xMesh, the DATAMANAGER implementation used can now be easily
     changed.  This is in previsison of what will be needed withe the mesh
     interface ... We need to be able to use something else than
     xAttachedDataManagerAOMD. To try with a new DATAMANAGER implementation,
    just change the definition of template type alias datamanager_t in
    xMesh. It was tested in particular with xUnorderedMapDataManager,
    and it imposed some slight changes in other files updated in this commit.
    In particular some class and function are now template on the
    DATAMANAGER implementation used.
    Testing with other implementation also reveiled some mistake in the
    implementation of .at(key) which are now corrected both in
    xUnorderedMapDataManager and xGeneralUnorderedMapDataManager.

MINOR POINTS :

    - changing the name of the preproc guards in xMesh.h that did not
      follow the
      usual format  in Xfiles
    - Racionaliz better the usage of xMesh.get_xxdatamanager() versus
      xMesh.get_xxconstdatamanager(). This make things more clear
      regarding to what function might or might not modify the xMEsh's data.
    - mMesh.createVertex(id, point, ...) is know used almost wherever
      possible in the library, improving
      readability (and may be cleaner compiled programm)

MODIFIED FILES
	modified:   xCrack/src/CrackPostpro.cc
	modified:   xCrack/src/IntegratorSingularCrack3D.cc
	modified:   xCrack/src/Jint3D.cc
	modified:   xCrack/src/Jint3D.h
	modified:   xCrack/src/lCrack.cc
	modified:   xCrack/src/xcFront.cc
	modified:   xCrack/src/xcFrontManager.cc
	modified:   xCrack/src/xcInteractionIntegralsOnCrack.h
	modified:   xCut/xDoubleCut/src/xPhysDomain.cc
	modified:   xCut/xDoubleCut/src/xPhysSurfCut.cc
	modified:   xCut/xLegacySimpleCut/src/xPhysSurf.cc
	modified:   xCut/xLegacySimpleCut/src/xRefCutToAOMD.cc
	modified:   xExt/src/DoubleCutting.cc
	modified:   xExt/src/SpaceLagrangeDualBoundary.h
	modified:   xExt/src/SpaceLagrangeDualMinBoundary.cc
	modified:   xExt/src/SpaceLagrangeDualNewBoundary.cc
	modified:   xExt/src/SpaceLagrangeDualSimple.cc
	modified:   xFEM/src/xApproxFunction.cc
	modified:   xFEM/src/xEntityToEntity.cc
	modified:   xFEM/src/xEntityToEntity.h
	modified:   xFEM/src/xGatherMesh.cc
	modified:   xFEM/src/xGatherMesh.h
	modified:   xFEM/src/xLevelSet.cc
	modified:   xFEM/src/xMesh.cc
	modified:   xFEM/src/xMesh.h
	modified:   xFEM/src/xMeshCut.cc
	modified:   xFEM/src/xNonLocalInfoForKeysAndFcts.h
	modified:   xFEM/src/xNonLocalInfoForKeysAndFcts_imp.h
	modified:   xFEM/src/xValueCreators.h
	modified:   xInterface/xOctree/src/AdaptOctreeToAOMD.cc
	modified:   xInterface/xOctree/src/AdaptOctreeToAOMD.h
	renamed:    xInterface/xOctree/src/AdaptOctreeToAOMD.cc -> xInterface/xOctree/src/AdaptOctreeToAOMD_imp.h
	modified:   xInterface/xOctree/src/InterfaceOctreeToAOMD.cc
	modified:   xInterface/xOctree/src/InterfaceOctreeToAOMD.h
	renamed:    xInterface/xOctree/src/InterfaceOctreeToAOMD.cc -> xInterface/xOctree/src/InterfaceOctreeToAOMD_imp.h
	modified:   xInterface/xOctree/src/OctreeUtilities.h
	modified:   xInterface/xTemplateRefineMesh/src/xSplitAOMD.cc
	modified:   xTLS/src/TLSVelocity.cc
	modified:   xTLS/src/reInitLevelSetFromFront.cc
	modified:   xTLS/src/reInitLevelSetFromFront.h
	new file:   xTLS/src/reInitLevelSetFromFront_imp.h
	modified:   xTLS/src/xAcceptNotHanging.cc
	modified:   xTLS/src/xAcceptNotHanging.h
	modified:   xTLS/src/xEvalWeightedDirectionalAverage.cc
	modified:   xTLS/src/xEvalWeightedDirectionalAverageMode.cc
	modified:   xTool/src/xGeneralUnorderedMapDataManager.h
	modified:   xTool/src/xUnorderedMapDataManager.h