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add GMRES restart option

joergbuchwald requested to merge github/fork/joergbuchwald/GMRES_options into master

add restart option for the GMRES solver (Eigen-unsupported). It sets the number of iterations before a restart is conducted. It can improve the convergence behavior. However, increasing the value comes with a tradeoff in time and memory. First tests suggest that the default value (30) is already quite optimal in most cases.

  1. Feature description was added to the changelog
  2. Tests covering your feature were added?
  3. Any new feature or behavior change was documented?

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