Findbugs: More findbugs fixes. Including but not limited to: null check fixes and some synchronization

   - Add torrent auto-stop support; enable for update file
   - Add tunnel auto-close when no torrents are running
   - Log/msg tweaks on add/create failures

   - new ROUTER_SIGNED_SU3 UpdateType
   - Add support for torrent and HTTP
   - Refactor UpdateRunners to return actual UpdateType
   - Deal with signed/su3 conflicts
   - unpack/verify stubbed only

   - Eepsite index.html better help on redirects
   - Remove exotrack (again)

 * I2CP:
   - Don't NPE when loglevel=warn
   - Don't enforce property length limits when inside router JVM
 * I2PSnark: Log uncaught error in ThreadedStarter to router log
 * I2PThread: Log uncaught error to wrapper log

   - Add idle detector, reduce tunnel count when idle (prep for torrent updates)
   - Cancel CoordinatorAcceptor cleaner when halted
   - Make PeerCoordinatorSet an Iterable
   - Reduce max protocol errors to 1
   - Disable unused PeerMonitorTask

   - Add data directory configuration to GUI (ticket #768)
   - Add page size configuration to GUI

   - Set unique tunnel nickname for additional instances
   - Increase page size to 50
   - Restore 1-arg SnarkManager constructor for compatibility
   - Add note about DHT file w/ multiple instances, to be fixed
   - Log tweak

   - Limit number of torrents displayed; add previous/next page buttons
   - Only register one instance with UpdateManager
   - New icons from famfam/silk, same license

  - Use servlet path as base for config file and data directory names,
    so we may have multiple instances running together
  - Don't override service(), use doGet() and doPost() instead

    Preliminary. Still todo: TrackerClient

- Don't lose all DHT peers if we stop quickly
- Explore a kbucket if it's less than 3/4 full
- Change release torrent file names

- New Storage.main() for use in the release process
- Make torrent files in release process
- Stop tunnel after fatal if no snarks are running

- Add progress indication
- Listener cleanup

- Move registration from servlet to manager and delay
- Fix plugin updates
- More logging

   - Add allocating and checking indications
   - Add bandwidth message at startup
   - More checks at torrent creation

   - Adjust DHT timeouts
   - Add max peers per-torrent in tracker
   - Remove duplicate clean task for nodes
   - Fix another DHT warning message

   - Fix bug preventing completion announcement, broken in 0.9.1
   - Fix setting short retry time after initial announce failure
   - Fix DHT announce and getPeers
   - Fix DHT warning message
   - log tweaks

             Log infohashes in hex
             Don't write out nodes if we don't have any

   - Remove static SnarkManager instance
   - Allow DHT-only torrents
   - DHT debugging

- Protect against null DHT races
- Add message about restarting tunnel when DHT config changes
- Add DHT size to table totals