Draft: option for Hypre preconditioner - #314
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Hypre does not allow copying to/from views, so make copies for input and allocate a temporary buffer for output for now.
Setup only needs to be done when matrix changes?
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Attempt at coupling Hypre library to use as preconditioner. So far does not perform well (in initial benchmarks, fails to converge (max 200 Newton iterations, 5 linear iterations per Newton step) where with LU preconditioner nonlinear solve converges after total of 3-4 linear iterations (=(Newon iterations) * (linear iterations per Newton step)). May well be a better result with different preconditioner settings, but there are very many parameters and I don't know how to tune them, so parking this feature for now.