- Refactor dup tracker detection

    Preliminary. Still todo: TrackerClient

Transifex.

Fixes a bug which caused the ordering to be non-functional.

The project files for jetty are in the apps/jetty folder. Dependencies will be
resolved once the project has been built normally once via e.g. "ant updater".

To import a branch of trunk into Eclipse, create a new workspace based in the
root directory of the checked-out branch, and then select "File -> Import..."
then "General -> Existing Projects into Workspace", then for "Select root
directory" choose the root directory of the branch (and of the workspace).
Select all projects that appear, so that dependencies are satisfied.

Currently left out are i2psnark, routerconsole and susimail, because they all
depend on jars in apps/jetty/jettylib, which seems to be auto-generated. Need
to check whether the existence of that folder (from having Eclipse files in it)
will prevent the jars being populated or not.

   Exploratory: +30
   IRC: +15
   HTTP Proxy: +10
   I2PSnark: -10

   - More DHT limits
   - Announce to backup trackers if DHT is empty
   - Use PEX and DHT info in torrent peer count
   - Don't use temp files for announces
   - TrackerClient refactoring
   - cleanups

   - Fix NPE after restart (ticket #763)
   - Move more nonces out of system properties

   - Better privkey backup file name
   - Revert increment of privkey tunnel name
   - Move deleted privkeys to backup dir
   - Fix jsp build dependencies
   - Fix layout issue on Chrome (ticket #757)

   - Split buckets correctly
   - More exploration fixes

*Behaviors.scala should really go in net.i2p.update.* in core, but ScalaTest
doesn't seem to be picking up the cross-dependency properly and just ignores
any Spec which includes them; they will move once the build.xml is fixed.