GUI: vos, unaccent, cut/paste on filter/search

- VO cells are now back again clickable (no hyperlink) but have authz for display and action.
- Suggestions in SuggestBoxes are offered unaccented, but filtering is kept accented.
- Use ExtendedTextBox/ExtendedSuggestBox on search/filter widgets to track cut/paste actions.
- Optimized imports in whole GUI by IDEA automatic tools.
- Fixed buttons (disabling/processing) on AddMemberToGroup tab.