[patch]util:give straightforward abort for -d '--2' to avoid typing mistake (issue2734)

[timeless]

On Mon, Apr 4, 2011 at 9:50 AM, yun lee <yun.lee.bj at gmail.com> wrote:
> +            raise Abort(_("%s is a negative number, do you mean %s?")

sorry to send multiple messages, but it should be 'did' not 'do' --
clearly my parser is "stop at first failure".

sorry :(