[Zope] Getting an authenticated user out of context

[Crosbie Fitch]

> From: Dieter Maurer
> I do not have much hope for your wish....

Thanks Dieter! :)

I was beginning to wonder which of the two typical newbie problems I was
facing, i.e. 'trying to do an easy thing the wrong way' vs 'trying to do the
wrong thing an easy way'. Probably the latter.

So, maybe my best bet is to replace my top level acl_users with an
ExUserFolder version...

That also avoids confusion as to which user someone is currently logged in
as.