[FIX] Sorting room list
[FIX] Show only active rooms on the drop down list

* PEP8 fixes
* Closes #1172
[FIX] Sorting in Room Booking admin page

* Closes #1172
[FIX] Clone Video Services Manager cloning event

- Closes #1091
[FIX] Removed unused value in clone options
[IMP] Global deadline change

 - Allow to set a deadline for all the existing papers at the same time.
 - Implemented new AJAX service to change all the deadlines at the same time.
 - Fixed to show the "Date has not been set yet" message when there is no deadline yet.
 - Included "Apply to all papers" button and "Saved/Error" feedback in the interface.
 - Ticket #198
[FIX] Several fixes after commit

- The service to apply the due date removed and it will apply when saving.
- See #198
[DOC] Updated PR doc
[FIX] Enable persistent signatures IE