thorium: disable some code in the delivery path

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: use FIFO order for message delivery path

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
genomics: increase the number of visitors

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