Make FastAMG work with non-blocked matrices

The internal operations of FastAMG assumed that the entries of the matrix are vectors are matrices and vectors themselves by making use of the dune matrix and vector interfaces. As a consequence FastAMG cannot be used with BCRSMatrix<double> in contrast to BCRSMatrix<FieldMatrix<double,1,1>>.

This patch introduces IsNumber-based switches in the respective places that use plain arithmetic operators if the matrix/vector is not blocked thus adds the missing support for e.g. BCRSMatrix<double>.

assigned to @markus.blatt

added 16 commits

• e0ac95e0...8de016aa - 15 commits from branch master
• 07b05428 - Make FastAMG work with non-blocked matrices

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mentioned in merge request dune-common!1499

approved this merge request

added 1 commit

• 9a8ecbc3 - Add missing includes

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resolved all threads

added 2 commits

• 3327e6e2 - [test] Test FastAMG with non-blocked BCRSMatrix
• 80961aae - [test] Make FastAMG-test deterministic

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For completeness test/fastamg now also checks the non-blocked version.

approved this merge request

merged

mentioned in commit e4079597

thanks a lot for this.