New way of choosing a free port for the server, seems jetty supports it
by using 0 as constructor arg
made IPanelLoader extend Serializable to avoid serialization warnings
when used as anon. inner class
Replaced the anon. inner class extended from DummyPanelPage by a static
inner class
set webapp root, expect maven layout
refactor test packages, added a WicketTester test as example on how to
test panels with WicketTester