Fix for a literal ParallelMesh corner case: we need to make sure that every processor with an element supporting a degree of freedom or node knows about any constraints affecting them.  This was triggered for me by a Dirichlet constraint with ParallelMesh load-balancing on, but I suspect it could have affected plain AMR constraints and/or systems with load-balancing off under other circumstances.
Fix for a literal ParallelMesh corner case: we need to make sure that every
processor with an element supporting a degree of freedom or node knows about
any constraints affecting them.  This was triggered for me by a Dirichlet
constraint with ParallelMesh load-balancing on, but I suspect it could have
affected plain AMR constraints and/or systems with load-balancing off under
other circumstances.



git-svn-id: e88a1e38e13faf406e05cc89eca8dd613216f6c4@6505 434f946d-2f3d-0410-ba4c-cb9f52fb0dbf

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