- Enforce min and max Jetty versions at plugin installation
    - Enforce I2P, Java, and Jetty versions at plugin startup too

Jetty 6 package.

- Add several jars from the Jetty 6 distribution
- Update jetty.xml
- Add context XML files
- Update WorkingDir to migrate the content XML files
- Update RouterConsoleRunner and LocaleWebAppHandler
- Remove all old Jetty 5.1.15 local mods;
  this will break Seedless using a custom Server() constructor
- Update I2PRequestLog to be a mod of NCSARequestLog from 6.1.26
- Put I2PRequestLog in its own jar
- Copy MultiPartRequest and other required classes from Jetty 5.1.15
  and add it to susimail, as the replacement MultiPartFilter in
  Jetty 6 is difficult to migrate to, and does not support content-type
- Update i2psnark for Jetty 6
- Disable i2psnark RunStandalone, unused and instantiated Jetty 5
- Fix up all webapp build.xml to reference new jars

Not yet working: Plugin/webapp run detection and stopping, eepsite CGI
Not well tested: Plugins, classpaths, webapps

    * DataHelper: Speed up eq() (Ticket #437)
    * HTTPServer: Strip inbound X-Accept-Encoding header
    * netdb.jsp: HTML fixes
    * Plugins: Log error when console server not found
    * Reseed: Log tweak

      The only defecency is that if one is running, that it considers the
      entire pliugin to be running. I'm not sure if that is a good thing
      or a bad thing, but the other code checks threads that way.

    Loading a class would be one of them!
    So we do a quick check first, If it bombs out, we delay and try again.
    If it bombs after that, then we throw the ClassNotFoundException.

      - Set classpath for specific client only, not for the whole JVM
      - Use ConfigDir() not AppDir()

      - Make target=_blank for plugin links

      - Always show start button for webapps and plugins
    * configclients.jsp, configupdate.jsp:
      - Fix submission when entering CR in a text box
    * Plugins:
      - Stop all plugins at shutdown
      - Log tweaks
    * WebApps:
      - Remove the WAC after stopping it
      - Stop a WAC before starting it to prevent dups

      - Negative delay means run immediately and inline
      - Add methods to test class and run inline,
        to propagate errors to the console
      - Add javadoc for clients.config format
      - Use new methods for plugins

      - Fix plugin start button
      - Change signer prop to match docs
      - Tweaks

      - Fix classpath setting for webapps
      - Implement uninstall args in clients.config

      - Hook up update/delete/check/save buttons
      - Implement delete
      - Hide unless router.enablePlugins=true

      - Check plugin key against all installed plugins
      - Reword some error messages
    * VersionComparator: add '-' and '_' as valid separators
      to better support plugin and java version checking