Less_Edge -> MEdgeLessThan, Equal_Edge -> MEdgeEqual, Hash_Edge -> MEdgeHash
  Less_Face -> MFaceLessThan, Equal_Face -> MFaceEqual, Hash_Face -> MFaceHash
  MVertexLessThan -> MVertexPtrLessThan, MVertexEqual -> MVertexPtrEqual, MVertexLessThanLexicographic -> MVertexPtrLessThanLexicographic
  Less_ElementPtr -> MElementPtrLessThan
  Less_Cell -> CellPtrLessThan
  GEntityLessThan -> GEntityPtrLessThan
  compareMLinePtr -> MLinePtrLessThan
  equalMLinePtr -> MLinePtrEqual

When OpenBoundaryPhysicalGroup is given and is an open curve, we should not duplicate its boundary nodes. Thanks @bsalves!

crack all elements from all entities except the crack entities (instead of just cracking elements from entities of dim+1)

fix 1D cracks: user should provide orientation of underlying surface in which the crack is supposed to be located

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