Merge branch 'issue/communicator_construction' into 'master'

src/amdis/functions/GlobalIdSet.hpp

src/amdis/functions/ParallelGlobalBasis.hpp

src/amdis/linearalgebra/Communication.hpp

src/amdis/linearalgebra/Traits.hpp

src/amdis/linearalgebra/istl/Communication.hpp

src/amdis/linearalgebra/istl/Communication.inc.hpp

src/amdis/linearalgebra/istl/Traits.hpp

src/amdis/linearalgebra/petsc/Communication.hpp

src/amdis/linearalgebra/petsc/Traits.hpp