fix various attribute normalisation problems reported by Ashwin this

* parser.c: fix various attribute normalisation problems reported
  by Ashwin
* result/c14n/without-comments/example-4
  result/c14n/with-comments/example-4: this impacted the result of
  two c14n tests :-\
* test/att9 test/att10 test/att11 result//att9* result//att10*
  result//att11*: added 3 specific regression tests coming from the
  XML spec revision and from Ashwin
Daniel

svn path=/trunk/; revision=3715
diff --git a/debugXML.c b/debugXML.c
index f66f596..de6fd6c 100644
--- a/debugXML.c
+++ b/debugXML.c
@@ -320,7 +320,8 @@
     }
     if (node->next == NULL) {
 	if ((node->parent != NULL) && (node->type != XML_ATTRIBUTE_NODE) &&
-	    (node->parent->last != node))
+	    (node->parent->last != node) &&
+	    (node->parent->type == XML_ELEMENT_NODE))
 	    xmlDebugErr(ctxt, XML_CHECK_NO_NEXT,
                     "Node has no next and not last of parent list\n");
     } else {