dev for Milestone 0.0.14

src/covid19/blueprints/europe/europe_model_import.py

src/covid19/blueprints/europe/europe_service.py

src/covid19/blueprints/europe/europe_service_update.py

src/covid19/blueprints/rki/rki_model.py

src/covid19/blueprints/rki/rki_model_import.py

src/covid19/blueprints/rki/rki_service.py

src/covid19/blueprints/rki/rki_service_download.py

src/covid19/blueprints/rki/rki_service_import.py

src/covid19/blueprints/rki/rki_service_update.py

src/covid19/blueprints/rki/rki_views.py

src/covid19/blueprints/vaccination/vaccination_model.py

...ovid19/blueprints/vaccination/vaccination_model_import.py

src/covid19/blueprints/vaccination/vaccination_service.py

...19/blueprints/vaccination/vaccination_service_download.py

...id19/blueprints/vaccination/vaccination_service_import.py

...id19/blueprints/vaccination/vaccination_service_update.py

src/covid19/blueprints/vaccination/vaccination_views.py

src/covid19/blueprints/who/who_model.py

src/covid19/blueprints/who/who_model_import.py

src/covid19/blueprints/who/who_service.py