[kronolith] access to system calendars via DAV

[Volker Schmidts]

After the upgrade from 4.0.5 to 4.1.0 our users can't access shared system
calendars using the WebDAV/ICS url. Browsing the DAV directory structure,
the "horde/rpc.php/kronolith/-system-" folder is empty.

Access to the system calendars within kronolith works fine, and the
WebDAV/ICS access to user-owned shared calendars also works.

Is this a know behaviour?