- Code cleanup
      - Add 4-hop option
      - Remove +/- 0-2 option

      in the request headers

      - Don't distclean in the updaterRouter target
      - Don't make prepUpdate and prepupdateSmall depend
        on distclean
      - Don't make susimail build always clean
      - Make pkg depend on distclean to be sure
      - Clean out more routerconsole and susidns files in 'ant clean'
      - i2ptunnel, routerconsole, susidns:
        Only build WEB-INF when necessary
      - systray: Only build jar when necessary
      - Don't build i2psnark standalone for the updater target

      - Add a signed Certificate type
      - Add a main() to PrivateKeyFile to generate
        Destinations with various Certificate types
      - Add a VerifiedDestination class to check Certificates
        of various types
      - Add a HashCash library from http://www.nettgryppa.com/code/
        (no distribution restrictions)
      - Allow non-null Certificates in addressbook

      see ConnectionOptions.java for analysis

Piles of pedantic lock checks to ensure we don't get deadlocked, it's ugly.

SusiMail JavaDoc additions.

     and 'ee93f3940b59255ddab5fa4aafd6f567f46783f7'

       - Fix behavior when router.isHidden=true
       - Delay StartExplorersJob for 10m at startup
       - More findbugs cleanups
    * netdb.jsp: Indicate if hidden

       - Update dbLookup profile stats in FloodOnlySearchJob
         and FloodfillVerifyStoreJob
       - Fix response time store in profile in SearchJob
    * profiles.jsp: Don't override locale number format,
       clean up the response time output for floodfills

       - Fix ff count (we forgot ourselves)
       - Don't become ff if hidden

       - Send back your routerinfo with the DSRM if not ff to
         spread the word that you aren't ff anymore
       - Fix behavior when router.isHidden=true

       - Remove unused tunnel.buildSuccess and tunnel.buildFailure
       - Remove tunnel.buildRequestTime and 5m rate stats from
         netDb, effective in next release

    * summary.jsp: Indicate if hidden

       - Don't do peer tests when hidden
       - Don't offer to introduce when hidden
       - Don't continually rebuild routerInfo when hidden
       - Don't continually rebuild routerInfo when
         i2np.udp.internalPort is set but i2np.udp.port is not
       - Remove some unused functions

       - Add -n count option
       - Add rtt output
       - Enhance help
       - Fix option handling