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Bugfix: Save CG-matrix and reuse AMG in CG-subspace in AMG-DG backends

Marian Piatkowski requested to merge bugfix/reuse-matrix-in-amg-dg-backends into master

This patch enables to skip the triple matrix product to compute the CG-matrix and to reuse the AMG for the CG-subspace on demand for both the sequential and the overlapping backend.

It fixes a bug in the overlapping case when used together with StationaryLinearProblemSolver with the matrix reuse turned on.

The default is the old behaviour.

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