UniquePtr has been deprecated for a while, time to completely remove it
UniquePtr has been deprecated for a while, time to completely remove it

We *still* see codes from time to time that use the old UniquePtr
alias (and sometimes it is copy/pasted from old code to new code), so
it will be good to finally remove it completely.

libMesh/libmesh,dschwen/libmesh,dschwen/libmesh,libMesh/libmesh,jwpeterson/libmesh,dschwen/libmesh,libMesh/libmesh,dschwen/libmesh,jwpeterson/libmesh,dschwen/libmesh,jwpeterson/libmesh,libMesh/libmesh,jwpeterson/libmesh,libMesh/libmesh,dschwen/libmesh,libMesh/libmesh,jwpeterson/libmesh,jwpeterson/libmesh,dschwen/libmesh,libMesh/libmesh,dschwen/libmesh,jwpeterson/libmesh,jwpeterson/libmesh,libMesh/libmesh