Fix Raviart-Thomas interpolation
In particular, test the first-order implementations, and test them for all facet orientations. This uncovers a few bugs which are fixed by this patch as well.
(cherry picked from commit 32a02606)
In particular, test the first-order implementations, and test them for all facet orientations. This uncovers a few bugs which are fixed by this patch as well.
(cherry picked from commit 32a02606)