WIP Feature/optimize tpfa
about 5% performance gain. The scvf can be replaced by a class that caches corners and geometry type if that's really needed e.g. for non-linear Neumann boundaries in convergence tests.
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Consider scv/scvf classes with and without geometries (mostly unnecessary overhead) -
replace boundaryInfo struct in bcTypes -
possibility to explicitly set NeumannNoFLow as boundary type