need an assignment operator.  Just assert that assignment is a no-op since we cannot redefine our communicator reference.
need an assignment operator.  Just assert that assignment is a no-op since we cannot redefine our communicator reference.

Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh