Log Message:
Update to 16.0.0

Upstream changes:
Nextcloud 16 is smarter than ever, with machine learning to detect suspicious
logins and offering clever recommendations. Group Folders now sport access control
lists so system administrators can easily manage who has access to what in
organization-wide shares. We also introduce Projects, a way to easily relate
and find related information like files, chats or tasks.

As this is a major release, the changelog is very long.
Please visit: https://nextcloud.com/changelog/