adding namespace checkings while making sure they still parse as

* parser.c parserInternals.c tree.c include/libxml/parser.h
  include/libxml/xmlerror.h: adding namespace checkings
  while making sure they still parse as wellformed documents.
  Add an nsWellFormed status report to the context, and
  provide new appropriate error codes.
* Makefile.am result/namespaces/* test/namespaces/*: add
  specific regression testing for the new namespace support
* test/att5 result/noent/att5 result/att5 result/att5.sax:
  add more coverage for the attribute parsing and normalization
  code.
Daniel
diff --git a/include/libxml/xmlerror.h b/include/libxml/xmlerror.h
index a71f327..2b74b1d 100644
--- a/include/libxml/xmlerror.h
+++ b/include/libxml/xmlerror.h
@@ -135,8 +135,12 @@
     XML_ERR_INVALID_URI, /* 91 */
     XML_ERR_URI_FRAGMENT, /* 92 */
     XML_WAR_CATALOG_PI, /* 93 */
-    XML_ERR_NO_DTD  /* 94 */
-}xmlParserErrors;
+    XML_ERR_NO_DTD,  /* 94 */
+    XML_NS_ERR_XML_NAMESPACE,
+    XML_NS_ERR_UNDEFINED_NAMESPACE,
+    XML_NS_ERR_QNAME,
+    XML_NS_ERR_ATTRIBUTE_REDEFINED
+} xmlParserErrors;
 
 /**
  * xmlGenericErrorFunc: