Draft: Resolve "Ordering of affected lessons in register absence dialog is wrong"

Closes #342

aleksis/apps/alsijil/models.py

@@ -242,6 +242,7 @@ class Documentation(CalendarEvent):
             None,
             event_params,
             with_reference_object=True,
+            order_by=["odatetime"]
         )
 
         return Documentation.get_documentations_for_events(start, end, events, incomplete)