[ci-skip]

It was a no-op in the sidebar anyway.

To the annotationUI service. This allows deleted annotations to be
removed from the selection object.

This makes AnnotationSync reusable, because independent of $rootScope.

These changes should only be made to the AnnotationUISync service.

From commits f410217 and 0e95e1c

This keeps track of the annotation interface between the two frames.