thorium: enable multiplexer with a low timeout

Link: https://github.com/GeneAssembly/biosal/issues/739
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: reinstate the work stealing code on bgq

Link: https://github.com/GeneAssembly/biosal/issues/736
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
assembly: move vertex bins in actor

Link: https://github.com/GeneAssembly/biosal/issues/741
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>