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UserAndGroupSelectionWidget
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Purpose
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UserAndGroupSelectionWidget is an Archetypes widget to search and select users
and/or groups from a huge base of users. It uses a modernized, fast code-base
and is tested with hundreds of groups and thousands of users.

It is configureable to select only groups, only users, both or only user of a 
distinct group.

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Dependencies
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* bda.cache

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Author and Copyright
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Thanks to panjunyong (panjy at zopen.cn) for his work on ATMemberSelectWidget,
which was the base for idea (and some parts of the code) of this Widget.

Authors: 

- Robert Niederreiter <rnix@squarewave.at>,
- Jens Klein <jens@bluedynamics.com>,  
- Johannes Raggam <johannes@bluedynamics.com>,

Copyright (C) 2007 BlueDynamics Alliance, Klein & Partner KEG, Austria

This code was made for BKS Chur Project: 
Communication-Platform/Intranet/e-learning.
