Merge branch '265-dialog-long-term-absences' into 261-add-absence-management-to-course-book-student-dialog # Conflicts: # aleksis/apps/alsijil/schema/__init__.py
& use in DocumentationBatchCreateOrUpdateMutation & AbsencesBatchCreateMutation.
& use documentations instead of lesson-events
into get_documentations_for_events & get_for_coursebook This makes it reusable for further purposes (absences).