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Parallel solving only for overlapping grids

Lukas Riedel requested to merge feature/parallel-solve-ovlp-only into master

Since parallelism on non-overlapping grids currently does not work out (!9), we will only support parallel computations on overlapping grids (YaspGrid, that is) for now. See #6.

Features:

  • parallel solve on YaspGrid with Overlap
  • collective HDF5 file reading
  • revisited verbosity: only rank 0 writes into std::cout
  • created tests for comparing sequential and parallel output
  • extend tests to 3D cases
  • remove comments in param_base.hh regarding processor rank queries
  • throw if computation on UG grid is run in parallel
  • quick-check if CG is faster than BiCGSTAB (it's not!)

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