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Add istl based inverse operator with parallel amg support

Janick Gerstenberger requested to merge feature/istl-invop-parallel-amg into master

This is the istl based inverse operator martin and me wrote to

  • use the amg preconditioner
  • be able to use another linear operator as preconditioner

the operator brings its own communication layer for the istl side. (These where missing in the verion removed in !346 (merged))

Edited by Janick Gerstenberger

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