starts to look okay, really plugged the new framework, cleaned a lot of

* catalog.c parser.c xmlIO.c xmlcatalog.c xmllint.c
  include/libxml/catalog.h: starts to look okay, really
  plugged the new framework, cleaned a lot of stuff,
  added some APIs, except the PI's support missing this
  should be mostly complete
* result/catalogs/* test/catalogs/*: added new test, enriched
  the existing one with URN ID tests
Daniel

parser.c

@@ -10100,5 +10100,8 @@ xmlCleanupParser(void) {
     xmlParserInitialized = 0;
     xmlCleanupCharEncodingHandlers();
     xmlCleanupPredefinedEntities();
+#ifdef LIBXML_CATALOG_ENABLED
+    xmlCatalogCleanup();
+#endif
 }