Added the part about section 7.2 on URI resolution, fixed a side effect in

* include/libxml/catalog.h catalog.c xmlIO.c HTMLparser.c:
  Added the part about section 7.2 on URI resolution,
  fixed a side effect in the HTML parser, look complete
  and ready to rock except the URI/SystemID part!
Daniel
diff --git a/HTMLparser.c b/HTMLparser.c
index 6824ddd..d13f8c1 100644
--- a/HTMLparser.c
+++ b/HTMLparser.c
@@ -3739,6 +3739,7 @@
     ctxt->validate = 0;
     ctxt->nbChars = 0;
     ctxt->checkIndex = 0;
+    ctxt->catalogs = NULL;
     xmlInitNodeInfoSeq(&ctxt->node_seq);
 }