Let real_to_standard_face_vertex (and its inverse, standard_to_real_face_vertex) return something useful also in 2D. To this end, remove an unneccessary TODO, and introduce two new Asserts.
Let real_to_standard_face_vertex (and its inverse, standard_to_real_face_vertex) return something useful also in 2D. To this end, remove an unneccessary TODO, and introduce two new Asserts.

git-svn-id: 31d9d2f6432a47c86a3640814024c107794ea77c@15303 0785d39b-7218-0410-832d-ea1e28bc413d

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