Printing addres labels

This document describes and tests printing address labels.

>>> settings.SITE.appy_params.update(raiseOnError=True)
>>> test_client.force_login(rt.login('robin').user)
>>> def mytest(k):
...     url = 'http://127.0.0.1:8000/api/{0}?an=print_labels'.format(k)
...     res = test_client.get(url, REMOTE_USER='robin')
...     assert res.status_code == 200
...     result = json.loads(res.content.decode())
...     assert result['success']
...     print(result['open_url'])
>>> mytest("contacts/Persons")  
/media/cache/appypdf/127.0.0.1/contacts.Persons.pdf