The current situation is that all CU logs are together. Every user with CU
access on any wiki can view the whole log of every wiki. I guess it would be
better to let the CU's on the specific projects only have access to the log that
shows only the CU-actions of that specific project. Not of the other projects.
The other part of the request is that stewards have through meta access to the
combined log of all CU-actions. (as it is now available on every single wiki).
<this is a spin off from bug 8705, per request of rob.