- removed all internal calls of Smarty::instance()

- fixed code in double quoted strings

libs/sysplugins/method.isdebugging.php

@@ -11,15 +11,11 @@
 */
 
 /**
-* Smarty class isDebugging
-* 
 * is debugging
 */
-class Smarty_Method_isDebugging extends Smarty_Internal_Base {
-    public function execute()
-    {
-        return $this->smarty->debugging;
-   } 
+function isDebugging($smarty)
+{
+    return $smarty->debugging;
 } 
 
 ?>