delegation completes access control

I've finally finished access control in AW3 (checked in, but not yet released). We already had read and write access control, where such permissions could be limited to a single user or group. But only those able to modify the /Users table were able to add users to groups.

The new addUser and removeUser commands complete the picture, finally. These commands are available to anyone who is an admin for a Cabinet, and that means everyone can use them for creating groups for their own personal Cabient, at a minimum.

Once installed on agilewiki.org, it means that every registered user will be able to administer their own area as if it were an independent Wiki, including access control.