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ShyLU: Reorganization of the FROSch coarse operators & fixing of tests

James Willenbring requested to merge searhein:Reorganizing-coarse-space-construction into develop

Created by: searhein

@trilinos/shylu

Description

  1. I have started to reorganize the FROSch coarse operators. This will be helpful to create a Stratimikos adapter for FROSch. In my current changes, I have introduced the intermediate class FROSch::HarmonicCoarseOperator between FROSch::CoarseOperator and FROSch::GDSWCoarseOperator. No additional functionality was added so far.
  2. I have also added 2D tests for FROSch that can be run with ctest; see #2375. Unfortunately, I am not able to add reasonable 3D tests at the moment because at least 8 MPI-ranks would be necessary for 3D tests.

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