Feature/helmholtz operator

Merged Timo Koch requested to merge feature/helmholtz-operator into master
  • Add a Helmholtz operator assemble useful for solver testing or as a component in a preconditioner
  • Add a test using the Helmholtz operator and the multi-threaded AMG smoothers (there is a nice speed-up)

The operator is based on the initial implementation in !3240 where it was used as a Stokes solver component

Edited by Timo Koch

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