Remove user/site suggestions (autocompletion) from search inputs, as the UX isn't proper.

* 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

wp-admin/network/users.php

@@ -245,9 +245,6 @@ get_current_screen()->set_help_sidebar(
 	'<p>' . __('<a href="http://wordpress.org/support/forum/multisite/" target="_blank">Support Forums</a>') . '</p>'
 );
 
-if ( ! wp_is_large_network( 'users' ) )
-	wp_enqueue_script( 'user-search' );
-
 require_once( '../admin-header.php' );
 
 if ( isset( $_REQUEST['updated'] ) && $_REQUEST['updated'] == 'true' && ! empty( $_REQUEST['action'] ) ) {