When I change my login in another window, this window doesn't show that

Summary: That is, if I have two tabs open as Mark, and I log one of them out and log in again as Justin, the other still shows Mark until we do a hard-refresh.

This is not a security problem -- the cookies are updated correctly, and I only have the rights of the currently-logged-in user. But it is very confusing, and reflects the fact that the user info in the client is too static. We need to detect the cookie change and update correctly in some fashion. (Possibly the current login info should be in the cookie, not in the client?)

Now that we have metadata in the communication pathway, this probably is not a crazy-hard enhancement.