karma: added disabled awards for geoip and p0f

as examples for how to use them
karma: added DSL for karma awards, see karma.ini

so .ini config can have things like, "if length gt 2" or "if equals 5" or "if match yes"

use exports syntax and avoid having to pass plugin refs around
added hook_rcpt_ok, so karma get called after another RCPT plugin return OK (makes the rcpt limits work better)