deal with imbalance by flushing big messages early

Link: https://github.com/GeneAssembly/biosal/issues/428
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
fix the biosal timer code for Blue Gene/Q

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