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[solver] Parallel ssor preconditioned cg solver

Timo Koch requested to merge feature/parallel-cgsolver into master

Create a parallel CG solver with SSOR preconditioner using the AMG infrastructure. @bernd, it does converge but I needs quite a bit more iterations (almost twice) than in the sequential case. Is that something you'd expect or is the parallel index set somehow made for AMG and doesn't work well with SSOR?

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