Elem::topological_neighbor improvements
Elem::topological_neighbor improvements

Fix segfault in the case where no neighbor exists.

Don't use a mesh query where a const_cast will do.

90jrong/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,90jrong/libmesh,svallaghe/libmesh,benkirk/libmesh,vikramvgarg/libmesh,friedmud/libmesh,roystgnr/libmesh,balborian/libmesh,jwpeterson/libmesh,svallaghe/libmesh,vikramvgarg/libmesh,balborian/libmesh,svallaghe/libmesh,jwpeterson/libmesh,capitalaslash/libmesh,capitalaslash/libmesh,balborian/libmesh,pbauman/libmesh,pbauman/libmesh,vikramvgarg/libmesh,jwpeterson/libmesh,dschwen/libmesh,giorgiobornia/libmesh,friedmud/libmesh,vikramvgarg/libmesh,pbauman/libmesh,capitalaslash/libmesh,jwpeterson/libmesh,hrittich/libmesh,svallaghe/libmesh,dschwen/libmesh,giorgiobornia/libmesh,vikramvgarg/libmesh,roystgnr/libmesh,libMesh/libmesh,friedmud/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,balborian/libmesh,libMesh/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,90jrong/libmesh,giorgiobornia/libmesh,vikramvgarg/libmesh,balborian/libmesh,benkirk/libmesh,dschwen/libmesh,capitalaslash/libmesh,balborian/libmesh,libMesh/libmesh,balborian/libmesh,roystgnr/libmesh,jwpeterson/libmesh,BalticPinguin/libmesh,vikramvgarg/libmesh,vikramvgarg/libmesh,90jrong/libmesh,giorgiobornia/libmesh,90jrong/libmesh,vikramvgarg/libmesh,giorgiobornia/libmesh,giorgiobornia/libmesh,dschwen/libmesh,hrittich/libmesh,BalticPinguin/libmesh,benkirk/libmesh,roystgnr/libmesh,90jrong/libmesh,90jrong/libmesh,benkirk/libmesh,friedmud/libmesh,friedmud/libmesh,pbauman/libmesh,pbauman/libmesh,roystgnr/libmesh,hrittich/libmesh,svallaghe/libmesh,svallaghe/libmesh,dschwen/libmesh,capitalaslash/libmesh,friedmud/libmesh,benkirk/libmesh,pbauman/libmesh,libMesh/libmesh,hrittich/libmesh,90jrong/libmesh,balborian/libmesh,benkirk/libmesh,friedmud/libmesh,benkirk/libmesh,balborian/libmesh,capitalaslash/libmesh,90jrong/libmesh,friedmud/libmesh,giorgiobornia/libmesh,svallaghe/libmesh,svallaghe/libmesh,capitalaslash/libmesh,pbauman/libmesh,dschwen/libmesh,hrittich/libmesh,libMesh/libmesh,jwpeterson/libmesh,libMesh/libmesh,balborian/libmesh,dschwen/libmesh,hrittich/libmesh,benkirk/libmesh,jwpeterson/libmesh,jwpeterson/libmesh,BalticPinguin/libmesh,giorgiobornia/libmesh,svallaghe/libmesh,BalticPinguin/libmesh,BalticPinguin/libmesh,giorgiobornia/libmesh,libMesh/libmesh,roystgnr/libmesh,hrittich/libmesh,dschwen/libmesh,pbauman/libmesh,hrittich/libmesh,pbauman/libmesh,friedmud/libmesh,benkirk/libmesh,libMesh/libmesh,hrittich/libmesh