Make sure the solution satisfies hanging node constraints after solution transfer.
Make it compile.
Address Timo's concerns about code.
Add some commentary.
Fix description at the top.
Describe what the test actually does (the previous description was simply wrong).
Update test results.
Re-sort a few statement. Make sure we also distribute() the mesh
velocity vector.
Re-indent a couple of lines.
Leave a TODO.
Add a new ConstraintMatrix to keep the mesh conforming on redistribution with a free surface
Merge pull request #4 from ian-r-rose/fix-solution-transfer-with-hanging-nodes

Add a new ConstraintMatrix to keep the mesh conforming on redistribution
Update test output.
Merge pull request #143 from bangerth/fix-solution-transfer-with-hanging-nodes

Make sure the solution satisfies hanging node constraints after solution transfer