thorium: use a lower threshold to declare a congestion

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: spawn more actors with THORIUM_ADAPTATION_FLAG_SMALL_MESSAGES

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: move adaptive actor configuration option in configuration.h

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: increase ideal buffer size from 4 KiB to 8 KiB

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: report message count buffered in node outbound queue

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: use MessageCountInTransport instead of ActiveRequestCount

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: add frequency with -print-thorium-data

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