This is a replacement task to  FS#538 :
instead of moving things to dune-common, we could
introduce a new dune module (name suggestions welcomed)
which contains:
1) parts from the generic geometries
(generic construction classes, corner mappings...)
2) the geometry type
3) the generic reference elements
4) the quadratures
5) a geometry interface class
6) ...
both dune-grid and dune-localfunctions
would depend on this module.
It would increase the non-monolithic design
(removing geometry type from dune-common, quadratures and
reference elements from dune-grid) and would
make the dependency between modules a lot clearer.

The transition could be done smoothly by adding deprectaed headers in
the appropriate places.