[Dune] [#671] GridFactory: index translation for coarse grid creation

[Dune]

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FS#671 - GridFactory: index translation for coarse grid creation
User who did this - Martin Nolte (nolte)

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I agree that the boundary index should be a real index, i.e., a local, zero-based, contiguous integer (otherwise we could also use the level-0 id of the face).

As the index is attached to the grid, which need not be created by a grid factory (e.g., YaspGrid), I suggest to have the method boundarySize (or boundaryIndexSize, or whatever the name will be) on the grid.

The only other real possibility that I see would be a boundary index set (with methods index(Intersection) and size()). While  this might be more the DUNE style, it make grid implementation even more complicated.

If I understand correctly, boundary indices shall be persistent under adaptation (in contrast to existing index sets - yet another argument against a real boundary index set).

The question that remains is, how to treat the boundary index during load balancing. As a local, zero-based, contiguous index it cannot be persistent during load balancing, since the number of boundaries might shrink on one process. Here, I think we can attach the data to the level-0 id of the face (which has to coincide with the intersection).
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