Make it possible to retain surface information through supermeshing for the tetrahedral intersector.
Make it possible to retain surface information through supermeshing
for the tetrahedral intersector.

The ++++, ----, +--- and ++-- cases are done. More cases to do.

iakovos-panourgias/fluidity,iakovos-panourgias/fluidity,jjo31/ATHAM-Fluidity,jrper/fluidity,rjferrier/fluidity,rjferrier/fluidity,jrper/fluidity,jjo31/ATHAM-Fluidity,iakovos-panourgias/fluidity,rjferrier/fluidity,jjo31/ATHAM-Fluidity,rjferrier/fluidity,rjferrier/fluidity,iakovos-panourgias/fluidity,jjo31/ATHAM-Fluidity,iakovos-panourgias/fluidity,jrper/fluidity,jjo31/ATHAM-Fluidity,jrper/fluidity,jrper/fluidity