@argh_named("add-system")
    @argh.arg('system', type=str, help='system name')
    @expects_obj
    def handle_add_system(self, arg):
        confman = self.get_confman(arg.root_dir)
        system_dir = confman.create_system(arg.system)
        self.log.debug("created: %s", system_dir)
add a sub-system
dataset/ETHPy150Open ohmu/poni/poni/tool.py/Tool.handle_add_system