def set_conf_opt(shortname=None):
return ConfOpt(None, True, shortname,<EOL>dict(action='<STR_LIT>', metavar='<STR_LIT>'),<EOL>False, '<STR_LIT>')<EOL>
Define a Confopt to set a config option.

    You can feed the value of this option to :func:`set_conf_str`.

    Args:
        shortname (str): shortname for the option if relevant.

    Returns:
        :class:`~loam.manager.ConfOpt`: the option definition.