* Removes all instances of site-search, so away it goes. Sidesteps a number of bugs with site-search.
* Renames user-search to user-suggest, which means it better describes the current behavior (autocompletion) while allowing for future behavior (instant search).
* Ties user suggestions to a single .wp-suggest-user class.
with help from markjaquith, helenyhou, wonderboymusic.
fixes#20835.
git-svn-id: http://core.svn.wordpress.org/trunk@21003 1a063a9b-81f0-0310-95a4-ce76da25c4cd
