Add Istl solver factory backend originally implemented by @msblatt
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Depends on MR 349 in dune-istl (merged)
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Depends on !1848 (merged)
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Supersedes !1839 (closed) and !1841 (closed).
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Fixes #810 (closed)
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Fixes #652 (closed)
TODO:
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Rebase if !1850 (merged) is merged and adapt structure to new parallel solver internal structure -
Fix template parameter -> only: <LinearSolverTraits>. Depends on fix for #805 (closed) (see !1850 (merged)) -
Deprecate old preconditioner params (without subgroup)?-> to be fixed for #825 (closed) -
Add unit test for the linear solver -> base on dune-istl test as suggested in !1850 (merged)
Notes to the reviewer
Test with dune master (uses solver factory) and dune 2.7 (uses amg). Only need to test test_richards_lens_*, test_shallowwater_dambreak and test_linearsolver