#19 Eliminate JDOM dependence

[Elliotte Rusty Harold]

JDOM is only used by the Eclipse plug-in in one class,
LaunchJesterAction. It should be straightforward to
eliminate this dependency by using DOM or even SAX
directly so that no extra JAR archive is required in
Java 1.4 and later.

In any case, the jdom.jar that is bundled will not run
in 1.3 and earlier because there's no SAX parser bundled.