[Dune] [#849] YaspGrid creates entities of unsupported codimension in communicate()

[Dune]

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FS#849 - YaspGrid creates entities of unsupported codimension in communicate()
User who did this - Steffen Müthing (smuething)

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Hi Robert,

as I need to write a generic wrapper for DataHandles, the simple approach outlined by you won't work,
unfortunately. I would need to do something more in line with the EntityProxy that is used in the DataHandle
wrapper of the GeometryGrid. On the other hand, I would like to avoid that overhead, since I don't ever support
more codimensions than the host grid.

So, until someone has time and adds the missing entities to YaspGrid, I think it would be better to not instantiate
those communicateCodim() methods for unsupported codimensions. It just seems a real waste of compile time to
generate those rather long and complicated methods, only to have them invariably throw an exception.

Moreover, I don't like the idea of creating those half-functional entity types for intermediate codims and requiring
users of the grid to be careful not to cause compiler errors in their DataHandle.
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