to "score" the included tickets

  of im_audit

  - moved PO.class.CategoryStore to PO.store.CategoryStore
  - Added a PreferenceStateProvider.js based on SenchaPreference,
    that still needs debugging

  Update of underyling store now works

  Drag-and-drop: Now calculating - more or less - correct
  values for mouse position. Now we need to shift the sprites

  Now handles the absence of im_audits pro/enterprise extensions

  Simplified drag-and-drop variables