Unlock the Edit Report Menus tree once the editing is done (& saved)

1. Added code to unlock the Edit Report Menus tree once the editing is done
and the menu is saved
2. Fixed sorting on the right side list view

issue #183
Merge pull request #192 from AparnaKarve/unlock_report_menus_tree_and_sort_list

Unlock the Edit Report Menus tree once the editing is done and the menu is saved