thorium_actor: add lightweight counters for actor messages

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
biosal_unitig_visitor: use local velocity instead of global velocity

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
visitor: add inbound and outbound throughputs

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: move the code that prints runtime information in a function

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium_node: track last received message and sent message counts

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