Previously, public profile information was available to anonymous users.

Now we limit public profile information to authenticated users only. If

a user marks their profile as private nothing has changed and it will

still not be visible to authenticated users (except for themselves and

staff). User infoboxes now use the updated logic so the same information

is visible.
While I was here I cleaned up the other profile test docstrings.
To make things consistent for LocalSites, LocalSite admins can now view

private profiles of their LocalSite members.

Ran unit tests.
Viewed a public profile while logged out and saw no profile information

aside from username.
Viewed a userbox for a user with a public profile and only saw their

username.