Allow RT elements to be defined on arbitrary cubes.
Reuse finiteelementmap from PDELab to handle different variants of local Raviart-Thomas elements. Due to missing dependencies several code segments have been copied from PDELab. Note: Tests show, that RT0 basis functions are continuous in normal direction across edges but do not have the same sign on edges. There are basis functions with value +1 on edges and other with -1.
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