[Dune] [#538] dependency dune-grid <-> dune-localfunctions

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FS#538 - dependency dune-grid <-> dune-localfunctions
User who did this - Peter Bastian (peter)

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There is another issue. I implemented mixed finite elements (RT0) and I recently thought about Hermite elements and C1 elements (Argyris, Bell triangle). In all those cases you have to apply a transformation to the local basis functions that depends on the geometry (Piola Transformation in RT). So far I put this transformation into the local operator and it works. But it also shows up in other places e.g. evaluation of a function in the VTKWriter and you have to program it twice. It would be much better to have a well-defined place for these transformations. 

If this place would be dune-localfunctions, then a dependence to dune-grid is natural.
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