Button spacing on config form

- Refactor dup tracker detection

           for Debian packages. Broken in 0.9.4. (Ticket #817)
           Remove unused shouldInstall() method.

    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