Resolve "PDF export for timetables"

Closes #51

See merge request !77

Resolve "Show print timetable button on mobile devices"

Closes #130

See merge request !154

Denote Teckids e.V. as licensor as defined by EUPL

See merge request !152

This is important to clarify the jurisdiction and court location in case of
license disputes.

Prepare django 3.2 update, update JSONStore migration

See merge request !151

Resolve "Selecting a calendarweek throws error 404"

Closes #108

See merge request !148

Update lockfile

See merge request !149

Add some bug fixes for next_lesson and timetable builder

See merge request !147

Merge branch '122-next_lesson-doesn-t-correctly-work-with-changing-validity-ranges-and-probably-also-year-changes' into 'master'

Resolve "next_lesson doesn't correctly work with changing validity ranges and probably also year changes"

Closes #122

See merge request !144

Merge branch 'master' into 122-next_lesson-doesn-t-correctly-work-with-changing-validity-ranges-and-probably-also-year-changes

Build docker

See merge request !142

Merge branch '123-django-db-utils-programmingerror-relation-chronos_chronosglobalpermissions-does-not-exist' into 'master'

Resolve "django.db.utils.ProgrammingError: relation "chronos_chronosglobalpermissions" does not exist"

Closes #123

See merge request !146

Merge branch '123-django-db-utils-programmingerror-relation-chronos_chronosglobalpermissions-does-not-exist' of edugit.org:AlekSIS/official/AlekSIS-App-Chronos into 123-django-db-utils-programmingerror-relation-chronos_chronosglobalpermissions-does-not-exist

Update dependency calendarweek to ^0.5.0

See merge request !145

Resolve "Next/prev functions for persons don't return the next/prev lesson"

Closes #121

See merge request !143

The order_by wasn't used in the old position because filter_person
uses an union query.