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Add MatrixIndexSet class

Carsten Gräser requested to merge feature/vector-based-matrixindexset into master

This is a drop in replacement for Dune::MatrixIndexSet from dune-istl. But it uses a sorted std::vector instead of a std::set internally for better performance. If you expect very dense rows, Dune::MatrixIndexSet may still perform better.

Using this in the operator assembler can improve performance measurably.

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