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Kilian Weishaupt authored Dec 18, 2019 and Kilian Weishaupt committed Mar 20, 2020

* this is needed for a Dirichlet-Dirichlet cc coupling
* the volVars of the other domain need to be deflected properly
* deflection of boundary volVars (within elemVolVars)
  only takes place if hasOnlyDirichlet is true