Merge branch 'feature/advanced-data-timetable-views' into 'master'

aleksis/apps/chronos/migrations/0010_absence_reason_name.py

...s/chronos/migrations/0011_absence_for_groups_and_rooms.py

...ps/chronos/migrations/0012_event_remove_absence_reason.py

aleksis/apps/chronos/migrations/0013_event_title_optional.py

aleksis/apps/chronos/models.py

aleksis/apps/chronos/static/css/chronos/timetable.css

...sis/apps/chronos/templates/chronos/partials/elements.html

aleksis/apps/chronos/templates/chronos/partials/event.html

aleksis/apps/chronos/templates/chronos/partials/holiday.html

aleksis/apps/chronos/templates/chronos/partials/lesson.html

.../apps/chronos/templates/chronos/partials/lessons_col.html

...s/apps/chronos/templates/chronos/partials/subs/badge.html

.../apps/chronos/templates/chronos/partials/subs/colour.html

.../apps/chronos/templates/chronos/partials/subs/period.html

...is/apps/chronos/templates/chronos/partials/subs/room.html

...apps/chronos/templates/chronos/partials/subs/subject.html

...pps/chronos/templates/chronos/partials/subs/teachers.html

.../apps/chronos/templates/chronos/partials/supervision.html

.../apps/chronos/templates/chronos/partials/week_select.html

aleksis/apps/chronos/templates/chronos/substitutions.html