[<channel>] [<thing> ...]
Returns the karma of <thing>. If <thing> is not given, returns the top
N karmas, where N is determined by the config variable
supybot.plugins.Karma.rankingDisplay. If one <thing> is given, returns
the details of its karma; if more than one <thing> is given, returns
the total karma of each of the things. <channel> is only necessary
if the message isn't sent on the channel itself.