content/ThreadVis.js: - deleteBox on displayVisualisationWindow to hide   small visualisation if displaying popup window - bugfix: registerCallback on preferences for   arc_radius and arc_difference was not done correctly - re-display small visualisation when closing   popup window - clear visualisation if switching accounts to prevent   display of wrong thread
content/ThreadVis.js:
- deleteBox on displayVisualisationWindow to hide
  small visualisation if displaying popup window
- bugfix: registerCallback on preferences for
  arc_radius and arc_difference was not done correctly
- re-display small visualisation when closing
  popup window
- clear visualisation if switching accounts to prevent
  display of wrong thread


threadvis/ThreadVis,threadvis/ThreadVis,threadvis/ThreadVis