tests: disable assertions on Blue Gene/Q

Assertions slow down the code.

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: add function to print a multiplexed buffer

Link: https://github.com/GeneAssembly/biosal/issues/811
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: don't index a buffer twice

The old code could possibly change the timestamp of
an already indexed buffer under special conditions.

This changeset fixes that.

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