The ant test file now also removes the compiled classes, making it extra slow.
However, otherwise EclEmma will start whining about double classes.
Be sure to make your test end with "Test", otherwise the ant file won't run it.

Removed the test-data/System folder, because I figured I might as well just use the source folder andthe outputdir.
This saves time and trouble with JmeDesktopSystem using ClassLoaders to obtain files instead of the filesystem.
Changed JmeSystemDelegateTest to no longer need the folder.

Finished testing JmeDesktopSystem.
Only 75% coverage due to some missing src files (Joal and Jogl stuff).
That makes it impossible to test them.