Commit Briefs
add a monitor functionality
this pings all the "interesting" events to clients that issued a IMSG_CTL_MONITOR, except to the one that generated such event.
print the "> " prefix only if -p is given
the prefix is nice to see, but can break the amused show | filters ... | amused load because sort(1), uniq(1) etc don't know how to strip the "> " and " " prefixes obviously.