Merge branch '300-allow-using-time-slot-numbers-in-long-term-absences-dialog-instead-of-datetimes' into 'master'

Resolve "Allow using time slot numbers in long term absences dialog (instead of datetimes)"

Closes #300

See merge request !464

Merge branch 'master' into 300-allow-using-time-slot-numbers-in-long-term-absences-dialog-instead-of-datetimes

Resolve "Not storing groups for documentations is kind of a problem"

Closes #351

See merge request !476

Update .dev-js/package.json

See merge request !474

Update .dev-js/.eslintrc.js

See merge request !473

Use hash of person overview instead of own URL for statistics

See merge request !470

Update tox.ini

See merge request !471

Delete .eslintrc.js

See merge request !475

Update .gitignore

See merge request !472

Did not make a difference. But now it's proper anyhow.

Merge branch '325-people-with-same-last-name-and-date-of-birth-are-only-shown-one-time-in-absence-dialog' into 'master'

Resolve "People with same last name and date of birth are only shown one time in absence dialog"

Closes #325

See merge request !469

Merge branch '352-coursebook-printing-does-not-work-when-teaches-don-t-have-short-name-set' into 'master'

Resolve "Coursebook printing does not work when teaches don't have short name set"

Closes #352

See merge request !466

Resolve "Add present option to absence creation form"

Closes #349

See merge request !461