Admin functions cleanup, and change how we do titles and parents in the backend

git-svn-id: http://svn.automattic.com/wordpress/trunk@4478 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/plugin-editor.php

@@ -1,9 +1,5 @@
 <?php
 require_once('admin.php');
-
-$title = __("Edit Plugins");
-$parent_file = 'plugins.php';
-
 wp_reset_vars(array('action', 'redirect', 'profile', 'error', 'warning', 'a', 'file'));
 
 $plugins = get_plugins();