2005-02-26 jrandom

    * Further streaming lib caching improvements
    * Reduce the minimum RTT (used to calculate retry timeouts), but also
      increase the RTT on resends.
    * Lower the default message size to 4KB from 16KB to further reduce the
      chance of failed fragmentation.
    * Extend tunnel rebuild throttling to include fallback rebuilds
    * If there are less than 20 routers known, don't drop the last 20 (to help
      avoid dropping all peers under catastrophic failures)
    * New stats for end to end messages - "client.leaseSetFoundLocally",
      "client.leaseSetFoundRemoteTime", and "client.leaseSetFailedRemoteTime"