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Feature/generalize newton

Timo Koch requested to merge feature/generalize-newton into master

Makes three things more general in the Newton

  • Allow to replace the name of the solver (default "Newton"). Can be useful in derived classes to overwrite.
  • Allow to overwrite the initial verbosity settings without using the parameter tree.
  • Support non-nested types like Dune::BlockVector<double> in the VariablesBackend (before, a nested Dune::BlockVector<Dune::FieldVector<double, 1>> was the only option)

Also add a setter/getter for the line search feature.

Remark: (For a later MR) I might be good to offer a Newton constructor that takes a parameter tree object from which the parameters are being read. This allows a programmatic way of initializing the Newton which is useful in (non-standard) programs where the Newton is just a component used in some function or something.

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