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The various MPI libraries seem all to have some memory leaks, thus we
do not seem to be able to use LSAN in these tests.

Disable any MPI internal failures with a suppresion file, as the various
MPI libraries (unfortunately) are not ASAN-safe.

The blocking factor can be set now with the new interface
set method. The default is 3

Autotuning still has to be implemented.

This closses issue #44

The various MPI libraries seem all to have some memory leaks, thus we
do not seem to be able to use LSAN in these tests.

Disable any MPI internal failures with a suppresion file, as the various
MPI libraries (unfortunately) are not ASAN-safe.