decode a query string into its key value pairs.

def deurlform_app(parser, cmd, args):  # pragma: no cover
    """
    decode a query string into its key value pairs.
    """

    parser.add_argument('value', help='the query string to decode')
    args = parser.parse_args(args)
    return ' '.join('%s=%s' % (key, value) for key, values in deurlform(args.value).items() for value in values)