Test project for moreUnit

Started to create a test project for moreUnit (org.moreunit.test) to reduce dependencies.
It took me while to figure out how it works.
Short summary:

• Create a plugin-project without content
• Copy plugin dependencies from MANIFEST.MF
• Add org.moreunit as a plugin dependency
• Needed to export the moreunit-packages ('Runtime'-tab in plugin.xml)
  

Preparation of a new release

I am planning to release a new version of moreunit and started to test the actual version.
There are some bugs which should be fixed but half of the work seems to be done.

Preferences UI

Because of the project specific prefs it was necessary to clean up the UI a little bit.
I redesigned the prefix/suffix configuration (which needs less space now).
As a consequence only one pref page is needed.

Some small enhancements

Fixed a NPE-bug, if the package does not exist, when a move refactoring needs to move some tests as well.
Started to clean up the preference page.