Upgrade from PassiveDNS < 1.0 to 1.0:

- If you are using custom tools to process the passivedns.log files,
  you need to be aware of the new output filed added (count). Also
  be aware of the unix timestamp now has microseconds! 

- If you are using pdns2db.pl you need to do the following:

  1) Stop current passivedns.
     Make sure that pdns2db.pl has processed passivedns.log
     Move the old passivedns.log away to archive.

  2) Then, in mysql:
     mysql> ALTER TABLE pdns ADD COUNT BIGINT(20) UNSIGNED NOT NULL DEFAULT '1' AFTER TTL;

  3) Install (build) the lastest passivedns and pdns2db.pl
     Start passivedns && pdns2db.pl