Use NemesisIO::read even on one processor
Use NemesisIO::read even on one processor

It's working well enough now that we can delete the "cowardly" ExodusII
fallback here.

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