Allow a default for "Visibility of Hosts/Services"
Currently, an admin user is allowed to see all hosts and services. This behavior may be deactivated, so the user only sees the hosts and services he/she is a contact for.
As a Checkmk admin, I would prefer to set a default for this option and new users. Also, it should be allowed to a user to overwrite this default as it is currently possible in the personal user settings.