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feature/flexible cg solver

Mathis Springwald requested to merge mathis.springwald/dune-istl:feature/flexible-cg-solver into master

This adds a flexible cg solver to solvers.hh and and a related test to solvertest.hh.

The flexible cg method is, in the case of variations of the preconditioner between iterations, more stable than the standard cg method.

Edited by Mathis Springwald

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