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Sum factorization for untstructured grids

René Heß requested to merge feature/sum-factorization-gmsh-files into master

On unstructured grids we need to make sure that the quadrature points on intersections on neighboring cells are visited in the same order. This is done using edge consistent grids and by constructing the geometry mappings in the right way.

Still missing:

  • Vectorization
  • Make UG grids edge consistent without writing and reading a gmsh file
Edited by René Heß

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