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[bugfix] Cleanup of AMG constructors

Simon Praetorius requested to merge simon.praetorius/dune-istl:issue/amg_constructors into master

Summary

Several constructors in AMG preconditioners can not work and when instantiated give compiler errors. This is corrected in the MR.

Details

  • Fixed mutable vs. const OperatorHierarchy argument in AMG, FastAMG, and KAMG
  • Removed nonexisting constructor-calls in KAMG

This fixes #75 (closed)

Note: Two (deprecated) constructors in KAMG are removed completely, since the initialization of the underlying AMG object with the given parameters is not possible, i.e. no corresponding AMG constructor is available.

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