Message size percentile

Link: https://github.com/GeneAssembly/biosal/issues/570
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
use a different prefix for thorium stuff

Link: https://github.com/GeneAssembly/biosal/issues/574
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>