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Feature/modified FCGSolver and CompleteFCGSolver

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

I have modified the FCGSolver a little bit so that it's easier to handle, and also renamed it for clarity to RestartedFCGSolver. Than I derived the CompleteFCGSolver from it.

The CompleteFCGSolver uses as many old search directions as possible. This results in more stability, but also in more average memory consumption.

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