Get rid of periodic patterns on Blue Gene/Q...

Link: https://github.com/GeneAssembly/biosal/issues/625
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
isolate active message count limit calculation

Link: https://github.com/GeneAssembly/biosal/issues/629
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
add stop.o actor module

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>