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Implement element geometry mapping as identity

Martin Nolte requested to merge feature/geometry-mapping into master

In absense of a reference element for geometry type none we allow the grid to choose its own reference element (on a per element basis). The only obvious restriction is the world dimension, which must coincide with the element dimension. For PolygonGrid elements we may thus simply choose the identity mapping. For lines and vertices, we use the linear mapping.

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