First draft for clone -u

[Peter Arrenbrecht]

On Wed, Oct 21, 2009 at 10:02 PM, Bryan O'Sullivan <bos at serpentine.com> wrote:
> On Wed, Oct 21, 2009 at 12:37 PM, Adrian Buehlmann <adrian at cadifra.com>
> wrote:
>>
>> I started trying to add option -u to the clone command.
>
> It would be good to know what the difference is between this and -r. I think
> I can see it, but it needs explaining anyway.

I guess the text for -r needs fixing. Like:

 -r  clone only this revision and all its ancestors

And the help text needs to mention -u when it talks about -U and
defaulting to default, of course.

-parren