Merge branch '267-add-export-functionality-to-absence-statistics-page' into 'master'

CHANGELOG.rst

.../frontend/components/coursebook/CoursebookPrintDialog.vue

...ponents/coursebook/statistics/StatisticsForPersonPage.vue

aleksis/apps/alsijil/frontend/index.js

aleksis/apps/alsijil/managers.py

aleksis/apps/alsijil/model_extensions.py

aleksis/apps/alsijil/schema/__init__.py

aleksis/apps/alsijil/tasks.py

...jil/templates/alsijil/print/partials/person_overview.html

...templates/alsijil/print/partials/register_coursebook.html

...s/alsijil/templates/alsijil/print/register_for_group.html

.../alsijil/templates/alsijil/print/register_for_person.html

aleksis/apps/alsijil/urls.py

aleksis/apps/alsijil/util/statistics.py

aleksis/apps/alsijil/views.py