Ghost User
2019-10-24T19:17:28+02:00

Closes #935 and #876

### Short description

Sync mailinglists with GSuite Groups

### Steps to use this feature

1. Set up the Admin SDK tokens using service accounts
2. Run `./manage.py sync_mailinglists`
3. This command is meant to run every hour

Creating/editing/deleting a mailinglist also syncs that specific list.