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

git-svn-id: https://develop.svn.wordpress.org/trunk@4478 602fd350-edb4-49c9-b593-d223f7449a82

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();