Current setup:
* Build desktopgui:
    * 'ant jar' in the desktopgui directory
    OR
    * 'ant desktopgui' in the i2p.i2p directory
* Place desktopgui.jar in the $I2P/lib/ directory.
* Add to .i2p/clients.config:
    #Desktopgui
    clientApp.6.args=
    clientApp.6.delay=5
    clientApp.6.main=net.i2p.desktopgui.Main
    clientApp.6.name=desktopgui
    clientApp.6.startOnLoad=true