[development] admin/user filter patch for core

[Chad Phillips -- Apartment Lines]

i've taken the time to revive jjeff's original patch for a user  
filter at admin/user.  the patch allows you to filter by role,  
permission, or status, and is a sorely needed piece of functionality  
for sites with large user bases.  at this point i haven't done more  
than update the patch to current HEAD and make a few minor tweaks--it  
definitely needs eyes on it, both for coding style and usability.   
i'd like to urge folks to please have a look at this work and help me  
get it core worthy prior to the code freeze--it would be a shame to  
see this slip another release cycle...

latest patch is here:

http://drupal.org/node/34505#comment-115938

and for those of you who just want to see it in action, i've taken  
the time to set up a demo site here:

http://userfilter.xcarnated.com/

chad