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add MPIHelper::instance method without arguments

Nils-Arne Dreier requested to merge nils.dreier/dune-common:mpihelper_instance_without_arguments into master

Sometimes it would be handy to access the MPIHelper object from outside the main function. Currently this is a bit tricky, as the MPIHelper::instance method expects the argc and argv arguments.

This MR adds a MPIHelper::instance() method, that do not expects any arguments. Unfortunately, this requires some changes of the internal implementation.

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