[Dune] [#533] GenericReferenceElements are buggy

[Dune]

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FS#533 - GenericReferenceElements are buggy
User who did this - Carsten Gräser (Carsten)

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Now the type is OK. But the (implicitly) given orientation of subentities is different from the old orientation, e.g. for the 1st edge of (simplex,2). Thus we have in general for an element e and the corresponding GenericReferenceElement gref

e.geometry().corner(gref.subEntity(i,codim,j,dim)) != e.subEntity(i,codim).geometry().corner(j)

This can only be fixed sufficiently by keeping the old orientation in GenericReferenceElement. Reorienting the subentities would also require to change the geometry and thus the jacobian. Hence old and new numbering could no longer coexist.
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