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

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

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@Oli: Read my above comment. Assume that you have a native grid implementation (e.g., ALU3d) that actually stores elements, faces, edges and vertices. Consider the case of an InteriorBorder-InteriorBorder communication (i.e., you send data only all border entities and receive data only on border entities). For each neighbor n of a process p we could now store a lists of border faces, edges and vertices that are shared between n and p. Basically, communication is then implemented by iterating over these lists calling gather, exchanging the data, and iterating over the lists calling scatter. To call gather / scatter, we have to construct a DUNE entity from the face, edge, or vertex. While it will be easy to generate an entity of the appropriate codimension (1,2, or 3), generating an entity of
codimension 0 would require the knowledge of an element containing the face, edge, or vertex, which might not be known.
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