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[BDFM] implement BDFM cube finite elements

Janick Gerstenberger requested to merge janick.gerstenberger/dune-localfunctions:feature/bdfm-spaces into master

The coefficients and interpolation are implemented for arbitrary dimension (>1) and order (>0). The actual basis is only implemented for dim =2 and order=1,2,3.

The basis was calculated with base.py

Note:

this MR depends on dune-common!471 (merged) for binomial(...)

Note to the interpolation:

The unrank(...) algorithm and its inverse rank(...) (not implemeted here) might be better moved into dune-common!471 (merged).

The split into trace and interior interpolation is the interface that I actually need for my code.

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