[Dune] Where to move test from genericgeometry/test?

[Christoph Grüninger]

Hi Dune,
I try to get rid of the deprecated genericgeometry code from dune-grid. 
I am puzzled where to move testgeo and testmapping from 
genericgeometry/test. Is
   dune/grid/test
or
   dune/grid/common/test
the more natural location? I tend to first option.

Thanks for sharing your thoughts
Christoph

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