- implementation of a 'variable' filter as replacement for default modifier

- update of unregister_....filter methods

libs/plugins/variablefilter.htmlspecialchars.php

@@ -0,0 +1,21 @@
+<?php
+/**
+* Smarty plugin
+* 
+* @package Smarty
+* @subpackage PluginsFilter
+*/
+
+/**
+* Smarty htmlspecialchars variablefilter plugin
+* 
+* @param string $source input string
+* @param object $ &$smarty Smarty object
+* @return string filtered output
+*/
+function smarty_variablefilter_htmlspecialchars($source, &$smarty)
+{
+    return htmlspecialchars($source, ENT_QUOTES);
+} 
+
+?>