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Draft: setupLaplacian: Add optional diagonal regularization

Patrick Jaap requested to merge patrick.jaap/dune-istl:feature/laplace-with-reg into master

This generalizes the necessary regularization for the umfpacktest and makes it usable for other algorithms. A hint in Cholmodtest is added and the other tests using this methods are kept unchanged.

The method was also cleaned up and modernized.

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