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

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FS#538 - dependency dune-grid <-> dune-localfunctions
User who did this - Jö Fahlke (joe)

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A more concrete example: Edge elements have DOFs in the edges and each DOF has an assosiated orientation along its edge (these directions must match in the global basis function).  When implementing the shape function, for each edge with local index i I need to know the local indices of the vertices at its endpoints to calculate the orientation.  I also need the center of and a tangential vector along each edge (which I can calculate from the positions of the endpoints of the edge).  This is all information which I can get from the reference elements.

Alternatively I have to duplicate that information in the code of the edge elements.  But I would rather avoid that, since then the edge elements depend on the particular numbering of the subentities in the reference element.  A lot of poeple will have a major headache in the near future, because they hardcoded that information.

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