Added allocation/deallocation functions for the DOM-wrapper context.

* tree.c include/libxml/tree.h: Added allocation/deallocation
  functions for the DOM-wrapper context.
diff --git a/include/libxml/tree.h b/include/libxml/tree.h
index 064571e..212eebf 100644
--- a/include/libxml/tree.h
+++ b/include/libxml/tree.h
@@ -1122,6 +1122,10 @@
 /*
 * DOM-wrapper helper functions.
 */
+XMLPUBFUN xmlDOMWrapCtxtPtr XMLCALL
+		xmlDOMWrapNewCtxt	(void);
+XMLPUBFUN void XMLCALL
+		xmlDOMWrapFreeCtxt	(xmlDOMWrapCtxtPtr ctxt);
 XMLPUBFUN int XMLCALL
 	    xmlDOMWrapReconcileNamespaces(xmlDOMWrapCtxtPtr ctxt,
 					 xmlNodePtr elem,