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Use the collective communication from the grid instead of the global one

Simon Praetorius requested to merge issue/writer-comm into master

Summary

Use gridView.comm() instead of MPIHelper::comm().

Do we need a way to changes this, e.g., manually set MPI_COMM_WORLD even if the grid is sequential? Maybe this has little applications. If it is just about setting the filename, there are also other ways.

Edited by Simon Praetorius

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