Update Smarty to 3.1.21

- add missing block.tphp, block.textformat.php, function.popup.php,
  function.popup_init.php
- update function in function.html_checkboxes.php,
  function.html_options.php

www/Smarty-3.1.21/plugins/modifiercompiler.from_charset.php

@@ -0,0 +1,33 @@
+<?php
+/**
+ * Smarty plugin
+ *
+ * @package    Smarty
+ * @subpackage PluginsModifierCompiler
+ */
+
+/**
+ * Smarty from_charset modifier plugin
+ * Type:     modifier<br>
+ * Name:     from_charset<br>
+ * Purpose:  convert character encoding from $charset to internal encoding
+ *
+ * @author Rodney Rehm
+ *
+ * @param array $params parameters
+ *
+ * @return string with compiled code
+ */
+function smarty_modifiercompiler_from_charset($params)
+{
+    if (!Smarty::$_MBSTRING) {
+        // FIXME: (rodneyrehm) shouldn't this throw an error?
+        return $params[0];
+    }
+
+    if (!isset($params[1])) {
+        $params[1] = '"ISO-8859-1"';
+    }
+
+    return 'mb_convert_encoding(' . $params[0] . ', "' . addslashes(Smarty::$_CHARSET) . '", ' . $params[1] . ')';
+}