Differences between version 3 and 2 of »PingBack«

  http://www.hixie.ch/specs/pingback/pingback can be implemented similar
  to the RefererLog extension, but that it uses XmlRpc to inject links
  from related/linking articles.
  For auto-discovery a new X-Pingback: HttpHeader must be transmitted
  with every page (pointing to our ==z.php== interface per default).
  !! interface
  int pingback.ping(sourceURL, targetURL)
  ----
  [mario]: Plugin ready and seemed to work in local tests (includes
  link verification like RefererLog).
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