Support extended stencil over a range of elements up #227
add boost parameter
move also some ghost elts if the displacement space contains this info
fix integration on interprocess faces (only one side)
up createsubmesh :
 - use the point numeration of parent mesh (by default) but renunumber is possible with adding MESH_RENUMBER
 - add boolean option subMeshIsOnBoundaryFaces(true by default) : reduce comm for submesh<MESH_FACES> and work only
 if the range is define only on boundary