Correct hanging node constraints #46
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In cases where the hanging dof i had a connection to dof j in the sparse matrix, but not j to i (asymmetric matrix) the constraint did not work properly.
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In cases where the hanging dof i has a connection to dof j in the sparse matrix,
but not j to i (asymmetric matrix), the P1 continuity constraint does not work properly.
FIXME comments to this effect are already present in the original code.
This commit addresses the problem and fixes it.