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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 configurable 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) 2007-2010 BlueDynamics Alliance, Klein & Partner KG, Austria

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

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Changes
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2.0.5 (Unreleased)
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* Fixed to be compatible with schema-extended fields (jcbrand)

2.0.4 (2011-07-08)
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* Plone 4 compatibility fixes (ajung)

2.0.2
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- sort list of groups in popup by group title (jensens, 2010-08-24)