scripts: enable transport profiler

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
genomics: don't send large messages

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
assembly: disable unitigs building for now

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
genomics: vertex classifier should be stateful

Instead of generating huge messages at the top of the
topology, the classifier layer is not buffering small messages.

This allows any receive() call to always be very fast.
The flush threshold currently sits at 4 KiB.

Link: http://biosal.s3.amazonaws.com/public/topology/spate-graph-vertices.svg
Link: https://github.com/GeneAssembly/biosal/issues/741
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>