fixed some doc blocks; removed some unused vars

core/AssetManager.php

plugins/Annotations/javascripts/annotations.js

plugins/CoreAdminHome/Controller.php

plugins/CoreHome/javascripts/broadcast.js

plugins/CoreHome/javascripts/calendar.js

plugins/CoreHome/javascripts/datatable.js

plugins/Dashboard/javascripts/widgetMenu.js

plugins/PrivacyManager/javascripts/privacySettings.js

plugins/SegmentEditor/javascripts/jquery.jscrollpane.js

plugins/UsersManager/javascripts/usersManager.js

plugins/Zeitgeist/javascripts/piwikHelper.js