Collective.listmonk

Bug fixes:

- If a subscriber unsubscribes but still has an unconfirmed subscription to another list, don't delete the subscriber. davisagli 16
- Fix translation of unsubscribe link. davisagli 17

New features:

- Unsubscribe links now include a subscriber UUID, so it's not possible to unsubscribe a different subscriber.
Also, if the user is unsubscribed from all lists, the listmonk subscriber will be deleted, to avoid retaining private data. davisagli 14
- Add options to customize the confirmation email for a newsletter. davisagli 15

Bug fixes:

- Make mailings GET service available on any content where the user has Send Newsletter permission. davisagli 13

New features:

- Send an email confirmation of a new subscription. davisagli 12

Bug fixes:

- Don't add header and footer to the email automatically, so the editor has control. davisagli 11

Bug fixes:

- Avoid runtime dependency on plone.app.robotframework. davisagli 10