Added a new defined constant to moodlelib.php, to be used by scripts with

php extensions that should not be called directly.  See SC19

Constant:   MOODLE_INTERNAL

lib/javascript.php

@@ -1,3 +1,5 @@
+<?php defined('MOODLE_INTERNAL') or die('Direct access to this script is forbidden.'); ?>
+
 <script language="JavaScript" type="text/javascript"
 
         src="<?php echo "$CFG->wwwroot/lib/overlib.js" ?>"></script>

lib/moodlelib.php

@@ -36,6 +36,9 @@
 
 /// CONSTANTS /////////////////////////////////////////////////////////////
 
+define('MOODLE_INTERNAL', true);  // Used by some scripts to check they
+                                  // are being called by Moodle
+
 define('NOGROUPS', 0);
 define('SEPARATEGROUPS', 1);
 define('VISIBLEGROUPS', 2);