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Moving num_facets from UFL to FFC?

 

I'd like to reduce the dependency of UFL on cell details as much
as possible, and num_facets is not needed anywhere in UFL.

Can someone change FFC to get this internally instead of fetching
it from the FormData from UFL? Then we can remove it from UFL.

The reason for this is that we want to compile UFL to frameworks
that are not limited to homogeneous meshes (with one cell type),
and then there is no unique num_facets.

Martin