- Install {@link Adapter} to watch for the addition or removal of model...

- Install {@link Adapter} to watch for the addition or removal of model elements to/from elements visible in this {@link AnnotationViewPartBase} (to trigger according updates).
- Ensure that all annotations for all offspring of the currently selected are shown in the view
- AnnotationViewPartBase no longer maintains a protected attribute with the list of current annotation entries, but triggers the abstract update(Collection<AnnotationEntry>) method at the right occasions (to be implemented by concrete views).
- Possible improvement in GenericAnnotationView: efficient implementation of update(Collection<AnnotationEntry>) (instead of complete redraw).
refs 1841