code: private AFTPClient actionRename() throws PageException, IOException {
  	required("existing", existing);
  	required("new", _new);
  
  	AFTPClient client = getClient();
  	client.rename(existing, _new);
  	writeCfftp(client);
  
  	return client;
      }
docs: rename a file on the server
  
  @return FTPCLient
  @throws PageException
  @throws IOException