thorium: add thorium_actor_log_with_level()

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
thorium: use LOG_LEVEL_DEFAULT for default log level

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

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
core: rename bitmap macros

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
core: use CORE_BITMAP_MAKE_FLAG to generate flag values

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
core: use the word flag instead of bit in bitmap macros

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
unitig_visitor: only print 2 digits after decimal point for throughput

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