[Dune] Extract host entity from GeometryGrid entity

[Christoph Grüninger]

Hi Martin,
maybe someone can prepare a proposal to get some of the experimental
grid extensions into the official release? It would be about time and
would be a nice topic for the next Dev meeting.

Bye
Christoph

-- 
AddressSanitizer is not expected to produce false positives.
If you see one, look again; most likely it is a true positive!
[http://clang.llvm.org/docs/AddressSanitizer.html]

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