[1.7.0] Implement and hook-in Tidy module setup.

- CommonAttributes factored into XMLCommonAttributes and NonXMLCommonAttributes
- Tidy abstract module was completely refactored in interest of usability
- Add friendly error message if module does not have name

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1070 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/HTMLModule/Tidy/XHTML.php

@@ -0,0 +1,20 @@
+<?php
+
+require_once 'HTMLPurifier/HTMLModule/Tidy.php';
+
+class HTMLPurifier_HTMLModule_Tidy_XHTML extends
+      HTMLPurifier_HTMLModule_Tidy
+{
+    
+    var $name = 'Tidy_XHTML';
+    var $defaultLevel = 'medium';
+    
+    function makeFixes() {
+        $r = array();
+        $r['@lang'] = new HTMLPurifier_AttrTransform_Lang();
+        return $r;
+    }
+    
+}
+
+?>