Superuser summary page

Superusers on the central server have access to data on all sharing networks.  Rather than using shell_plus commands to explore the data, we could simply be linking to explore zones, using our nice control_panel interface.  Bonus points because this means we're also testing our own code :D

This is a quick and dirty page for linking into each of those zones.  

Testing:
* Tested that it works
* Tested that non-super users can't have access.

Would like to get this in to 0.10.1.  Note that it might be useful to have a fast track for central server reporting releases--I'm pushing a bit hard on the central server reporting, and any reporting bugs could be fixed straightaway--no waiting.