[Dune] [#980] checkindexset.cc is to restrictive

[Dune]

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FS#980 - checkindexset.cc is to restrictive
User who did this - Martin Nolte (nolte)

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I agree with Andreas and Oliver: We should add a new Capability like "canIterate< Grid, codim >" and require only canIterate< Grid, 0 >::v = true.

As to communication: What should a subentity number? To simplify the implementation, I would rather suggest that entity.geometry() need not be implemented for codim > 0. Actually, the entity is the key to all indexing done in dune-grid and, therefore, seems like the optimal subentity number. Moreover, you can always implement higher codimension entities as an element (= entity of codim 0) and a subentity number.
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