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/parserInternals.c b/parserInternals.c
index 8b7b515..9a71a7c 100644
--- a/parserInternals.c
+++ b/parserInternals.c
@@ -2309,6 +2309,7 @@
     ctxt->userData = ctxt;
     ctxt->myDoc = NULL;
     ctxt->wellFormed = 1;
+    ctxt->nsWellFormed = 1;
     ctxt->valid = 1;
     ctxt->loadsubset = xmlLoadExtDtdDefaultValue;
     ctxt->validate = xmlDoValidityCheckingDefaultValue;