* weight_bbd: removed TODO, it's already implemented
* coordssession2bbd: emit iso date, not US format
* coordssession2bbd: emit only last IP address

  REMOTE_ADDR has all IP addresses cumulated, the original one and the
  X-Forwarded-For IP addresses. Keep only the last one, for easier
  parsing e.g. in weight_bbd.
* weight_bbd: new option -coordssession-data

  This cumulates statistical data about hops.
* bbd.pod: documentation for ignore_oldname_file directive
* data update