[Dune] grid.geometry is a bit restrictive

[Aleksejs Fomins]

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Dear Dune,

I just realised that CurvilinearGeometry has quite a few new user methods compared to linear geometries, for example, access to interpolation vertices, interpolation polynomials and functions thereof. The wrapper interface of grid.geometry class does not allow for adding these additional methods, so they will need to be accessed some other way.

I have decided to provide a grid method grid.basegeometry(entity), which would directly return the Dune::CurvilinearGeometry class, and not its grid wrapper. I realise that this goes against the paradigm of "protecting the users from themselves", but I do not see a good alternative at the moment.

Regards,
Aleksejs
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