Checks the current network. 
    
    Note: works only on localhost
   
    :param filetype: file type, default="PNG" 
    :param saveas: /path/to/non/tmp/file.prefix
    :param host: cytoscape host address, default=cytoscape_host
    :param port: cytoscape port, default=1234

    :returns: an image

def result(filetype="PNG",saveas=None, host=cytoscape_host,port=cytoscape_port):
    """
    Checks the current network. 
    
    Note: works only on localhost
   
    :param filetype: file type, default="PNG" 
    :param saveas: /path/to/non/tmp/file.prefix
    :param host: cytoscape host address, default=cytoscape_host
    :param port: cytoscape port, default=1234

    :returns: an image
    """
    sleep(1)

    def MAKETMP():
        (fd, tmp_file) = tempfile.mkstemp()
        tmp_file="/tmp/"+tmp_file.split("/")[-1]
        return tmp_file
    
    outfile=MAKETMP()
    
    extensions={"PNG":".png","PDF":".pdf","CYS":".cys","CYJS":".cyjs"}
    ext=extensions[filetype]
    
    response=cytoscape("view","fit content",host=host,port=port)
    response=cytoscape("view", "export" , \
                       {"options":filetype,\
                        "OutputFile":outfile},\
                      host=host,port=port)
    if host!='localhost':
        ssh = paramiko.SSHClient()
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        ssh.connect(host)
        ftp_client=ssh.open_sftp()
        ftp_client.get(outfile+ext,outfile+ext)
        ssh_stdin, ssh_stdout, ssh_stderr = ssh.exec_command("rm "+outfile+ext )
        
    img = WImage(filename=outfile+ext)
    if saveas:
        copyfile(outfile+ext,saveas)
    os.remove(outfile+ext)
    return img