- Committed Jeremy's incarnation of the statistics module.  Last minutes
  changes include:

    * a couple of coding style changes, renamed some "stats" into
      "statistics", etc.

    * removed the "Who's online" block from the user module.

    * added db_affected_rows() to the resp. database abstraction
      layers and made the statistics module use db_affected_rows()
      instead.

    * added update logic to "update.php".