Restrict attendee count to STATS access

AnthroCon keeps their attendee count under wraps until closing ceremonies - for that reason, we need to be able to hide it from all but certain admin accounts. I removed it from the attendee list and restricted the summary page to only accounts with Analytics access.
Ah, I kinda wondered why you had PEOPLE as an option here.

I've hidden the check-in number for AC under the COLLECT_INTERESTS option, which you can see below. If someone wants to try counting based on the number of pages shown and then leak that information, they can just face the wrath of AC's Board of Directors. :)

As for access levels, I do want to refactor admin accounts into a more granulated system of privileges, so you can set these things a bit easier. I think even if we just had one access type per site section that'd be more intuitive than the current system (when I read the list of access levels in the accounts page, I have little idea what corresponds to what).