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Fix Intel MKL Pardiso symbolic factorization

Reinhard Resch requested to merge fix-pardiso-symbfct into develop

This branch fixes an issue of the Intel MKL Pardiso linear solver which failed sometimes during the solution phase if the symbolic factorization was reused from a previous step. The new implementation uses a SHA1 checksum of the sparse matrix pattern in order to control when the symbolic factorization must be performed again.

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