Assert that parent() is really a parent
Assert that parent() is really a parent

We used to abuse the parent() link in some places before we added
support for interior_parent(), but that's old support now and it's
long past time for us to do things the straighforward non-confusing
way.

BalticPinguin/libmesh,hrittich/libmesh,hrittich/libmesh,hrittich/libmesh,hrittich/libmesh,dschwen/libmesh,jwpeterson/libmesh,jwpeterson/libmesh,roystgnr/libmesh,libMesh/libmesh,roystgnr/libmesh,libMesh/libmesh,roystgnr/libmesh,roystgnr/libmesh,BalticPinguin/libmesh,hrittich/libmesh,libMesh/libmesh,libMesh/libmesh,hrittich/libmesh,libMesh/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,dschwen/libmesh,BalticPinguin/libmesh,BalticPinguin/libmesh,capitalaslash/libmesh,dschwen/libmesh,capitalaslash/libmesh,capitalaslash/libmesh,jwpeterson/libmesh,roystgnr/libmesh,capitalaslash/libmesh,roystgnr/libmesh,libMesh/libmesh,dschwen/libmesh,dschwen/libmesh,dschwen/libmesh,jwpeterson/libmesh,jwpeterson/libmesh,BalticPinguin/libmesh,hrittich/libmesh,capitalaslash/libmesh,capitalaslash/libmesh,hrittich/libmesh,libMesh/libmesh,BalticPinguin/libmesh,jwpeterson/libmesh,capitalaslash/libmesh,dschwen/libmesh,dschwen/libmesh,libMesh/libmesh,hrittich/libmesh,capitalaslash/libmesh,roystgnr/libmesh,BalticPinguin/libmesh,jwpeterson/libmesh,jwpeterson/libmesh