improve LeaseSet lookups

      into memory for every lookup

      - 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

      messages after a while

thx merd@mail.i2p

      - Send numwant=0 if we don't need peers
      - Report returned complete and incomplete counts
        if higher than peer count
      - Allow missing peer list
      - Log tweaks

            to branch 'i2p.i2p' (head 995914d8e049d9bb695fd25e4cf5be860cd4e487)

      to fix bug where the burst stays high when limits
      are reduced.

     and '9df57c2abc8e859828f9edf80e9d104fd6bf6729'

     and '6cf70779bcd05bcf782d6d7bb8d131ce8d71426f'

      - 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