MMG5_split1, MMG5_split2sf, MMG5_split2, MMG5_split3, MMG5_split3cone…

…, MMG5_split3op, MMG5_split4sf, MMG5_split4op, MMG5_split5, MMG5_split6, MMG5_split1b_eltspl : edges created in a face of original tetra receive tags from this face (e.g. MG_BDY for boundary entities)