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

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FS#538 - dependency dune-grid <-> dune-localfunctions
User who did this - Andreas Dedner (dedner)

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As stated in the original post:
1) dune-localfunction has to depend on the Referenceelements and needs a interface for geometries
   (Piola transformation).
2) to implement isoparametric grids, it would be nice to use dune-localfunctions (e.g. higher order 
   Lagrange basis functions)
This means there is at the moment a circular dependency between dune-grid and dune-localfunctions.

So the idea was to move the ReferenceElements to dune-common since they are needed in both dune-grid
and dune-localfunctions. For most implementations this means that one include has to be changed and
the transition is smooth if we keep the header file in dune-grid.
For implementations using basic stuff from grid/genericgeometries (e.g. CornerMappings...) the 
transition is more invasive - but since GenericReferneceElement needs CordnerMapping for example
these files would also have to be moved to dune-common. 
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More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=538#comment1053

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