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[bugfix] Complex values in preconditioners

Simon Praetorius requested to merge simon.praetorius/dune-istl:issue/preconditioner_tests into master

Summary

tested preconditioners with complex and fixed configuration parameter extraction with correct type.

Details

The relaxation parameter in the preconditioners is of type Simd::Scalar<field_type> and one can not assign a complex<double> to that type. So, the parametertree get() function must be parametrized with the scalar type instead.

A test for the explicit template instantiation of all preconditioners is added to catch this error.

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