[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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At the point where the shape functions are transformed to a given entity you need
the geometry implementation - to implement in dune-localfunctions how to do this
you just need the geometry interface (or at least some part of it).
Reimplementing shape functions in two places is not a good idea imo. Isoparametric
elements are also interesting in 3./4. order, Lobattopoint based basis functions
are more stable that Lagrange - so prehaps a good idea and so on...

I would still like to see where the big invasion is. Why would dune-disc depend on
dune-localfunction? dune-grid would suggest dune-localfunction bit not need it.
The linear mappings made available by the generic geometries would still be available.
All functionality would remain the same as now without needing dune-localfunction - just
the location is changed...
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