[2.1.0] Implement MakeAbsolute URI filter

- Move some directives with complex dependencies to URIDefinition
- Fix a missing extends
- Add hierarchical information to URI schemes
- Fix bug in URIHarness.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1346 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/URIScheme/ftp.php

@@ -9,6 +9,7 @@ class HTMLPurifier_URIScheme_ftp extends HTMLPurifier_URIScheme {
     
     var $default_port = 21;
     var $browsable = true; // usually
+    var $hierarchical = true;
     
     function validate(&$uri, $config, &$context) {
         parent::validate($uri, $config, $context);