thorium: make a copy of the message when sending a message

This avoids side effects, for instance thorium_actor_send_range_loop
reuse the same message to send to many destinations.

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: enable binomial tree delivery route

Link: https://github.com/GeneAssembly/biosal/issues/781
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>