40.2  Polishing: Commented out button 'Explore' for Annotation Set Tab as it is not yet functional.
 40.3  Bug fix: Fixed the left border of the 'Discussion panel' and the resizing of the main panel so that it now takes the whole available space.
 40.1  Enhancement: Activated 'Retrieve Sets' in the 'Sets' right side panel. The resulting panel shows only the existing sets that can be loaded and will not list those sets that are already loaded in the Annotator.