New ghosting when redistributing Mesh
New ghosting when redistributing Mesh

This actually changes our behavior in the default case too, because I
noticed us doing something stupid: including point neighbors of our
inactive elements, not just of our active elements.

We might actually be able to get away with deleting neighbor children
too in most algorithms (e.g. by calculating jump terms at hanging
nodes only from the refined side) but we probably *aren't* writing all
our algorithms this carefully so we'll continue to make sure
everybody's ghosted a nice layer of active elements.

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