[Zope] adding acl_users properties

[Gregory Dudek]

  Far as I know, the best way to expand on the user information that
is stored is to move to a more powerful user-management
product.

  I found GenericUserFolder easy to use, configure and expand, and it's
simeple and (hence) really stable.

  It has been supplanted by more powerful products like CMF and 
SQL things, but when I looked a few weeks/months ago all the
alternative were either still development releases or
much harder to get going.

Greg