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Feature/scotch matrix reordering

Timo Koch requested to merge feature/scotch-matrix-reordering into master

Reordering the matrix leads to improved sparsity pattern. This is especially important for growing network grids.

Reordering results using the ReorderingDofMapper implemented by this MR with a growing network grid.

  • Original unsorted FoamGrid original
  • Reordered dof indices reordered

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