This adds the instance's Hostname to the collection data loaded when
editing a collection post or its metadata. While not technically needed
in this situation, it suppresses an alarming error log.
This renders all requests for that user's posts, collections and related
ActivityPub endpoints with 404 responses.
While suspended, users may not create or edit posts or collections.
User status is listed in the admin user page
Admin view of user details shows status and now has a button to activate
or suspend a user.