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CHOLMOD: Allow general matrixtype in setMatrix()

Patrick Jaap requested to merge patrick.jaap/dune-istl:feature/cholmod-any-matrixtype into master

Since CHOLMOD copies the matrix into a flat array it is not relevant what the block size of the input matrix is.

For example, you want to solve Ax = b with ignore nodes and also take care of truncation of x and b by yourself, you can simply set A as it is and call apply() with your preferred vector format (flat or blocked)

Edited by Patrick Jaap

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