Import first draft of pfbandwidthd
(debug) Log pcap stats everytime stats are saved

Simple mean to look for dropped packets
/die/logdie/
Implement most of pfbandwidthd

 - Keep track of firstseen and lastmodified of each ip in ip_stats
 - dynamically build pcap filters to ignore packets to/from our
   interfaces (and broadcast addresses)
 - Save statistics to database
 - check for error and die if privileges couldn't be dropped
implement inline_accounting_update_session_for_ip

It is used by pfbandwidthd to update the inline_accounting table.
Reworked db schema example