* Added a simple purge and ban of syndie authors, shown as the
      "Purge and ban" button on the addressbook for authors that are already
      on the ignore list.  All of their entries and metadata are deleted from
      the archive, and the are transparently filtered from any remote
      syndication (so no user on the syndie instance will pull any new posts
      from them)
    * More strict tunnel join throtting when congested