Do a recursive copy of the node list.

def copyNodeList(self, node):
        """Do a recursive copy of the node list. """
        if node is None: node__o = None
        else: node__o = node._o
        ret = libxml2mod.xmlDocCopyNodeList(self._o, node__o)
        if ret is None:raise treeError('xmlDocCopyNodeList() failed')
        __tmp = xmlNode(_obj=ret)
        return __tmp