v1.2.0

This minor release introduces a few small API changes:

• The /api/metadata endpoint no longer returns the list of surnames by default. The previous behaviour can be restored with the query parameter surnames=1.
• The /api/transactions endpoint got a new optional query parameter force. If true, object updates or deletions are executed even if the object has been modified in the meantime.
• Missing media files no longer raise a server error (status code 500), but return status not found (404) now.

In addition, an issue affecting the media archive import (#412) was fixed.