Added an initial version of xmlDOMWrapCloneNode() to the API. It will be * tree.c: Added an initial version of xmlDOMWrapCloneNode() to the API. It will be used to reflect DOM's Node.cloneNode and Document.importNode methods. The pros: 1) non-recursive, 2) optimized ns-lookup (mostly pointer comparison), 3) user defined ns-lookup, 4) save ns-processing. The function is in an unfinished and experimental state and should be only used to test it.