[3.1.0] Feature parity with configdoc rewrite

- Abolish most classes in ConfigDoc except for HTMLXSLTProcessor
- Implement Builder_Xml using XmlWriter
- Add some convenience functions

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1665 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/ConfigSchema/Validator.php

@@ -48,6 +48,7 @@ class HTMLPurifier_ConfigSchema_Validator
             if ($i != $id) $this->error(false, "Integrity violation: key '$i' does not match internal id '$id'");
             $this->validateDirective($directive);
         }
+        return true;
     }
     
     /**