headers: smite poorly behaved senders with -karma
helo: smite senders that fail the selected tests

and made log entries more terse
hosts_allow: allow +karma senders +3 concurrents

this is really useful if you set max-per-ip to <= 3.
p0f: added smite_os, assign -karma by OS
relay: give +2 karma boost to relay IPs
whitelist: add +5 karma to whitelisted IPs
karma: be a bit more conservative

require at least -2 karma before smiting
also, add +1 karma to senders with karma_history > 10
naughty: improve POD
qm_deliverable: added reject option, karma smite

award senders -1 karma to senders to invalid addresses
fcrdns: new plugin for Forward Confirmed rDNS