- Fix double completion message
      - Add crstrack

      - Disable ExploreKeySelectorJob completely, just have
        StartExplorersJob select a random key if queue is empty
      - Add netDb.alwaysQuery=[B64Hash] for debugging
      - Queue results of exploration for more exploration
      - Floodfills periodically shuffle their KBuckets, and
        FloodfillPeerSelector sorts more keys, so that
        exploration works well

      - Give each search a minimum of time even at the end
      - Fix ExploreJob exclude peer list
      - Always add floodfills to exclude peer list
      - Don't queue keys for exploration or run ExploreJob
        if floodfill
      - Allow floodfills to return non-floodfills in
        a DSRM msg so exploration works

      to account for the MTU increase in the last release

      - Expire routers with introducers after 90m.
        This should improve reachability to firewalled routers
        by keeping introducer info current.
      - Expire routers with no addresses after 90m.