Simplified cmdopts interface that does not default any parsing rules
       and that does not allow compounding calls to the parser.

def cmdline(argv, rules=None, config=None, **kwargs):
    """Simplified cmdopts interface that does not default any parsing rules
       and that does not allow compounding calls to the parser."""
    parser = Parser(rules, **kwargs)
    if config is not None: parser.loadrc(config)
    return parser.parse(argv).result