checkins: PUSecurityWidget and PRTagCloudWidget

[Nick Ager]

Hi,

I've checked in a couple of changes:

Pier-Security-NickAger.162
"removed editUser hack from PUSecurityWidget by adding PUEditUser command"
The motivation for this change was that the existing edit user hack was
ignoring the editing environment I wanted to use (see
http://www.iam.unibe.ch/pipermail/smallwiki/2010-February/005763.html)

Pier-TagCloud-NickAger.16
"added additional stop words"

Hope these work for everyone

Nick
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