crew-stable/raw-rev/4d3a60d5c490, improve help text for clone -U

[Dirkjan Ochtman]

Adrian Buehlmann wrote:
> I think
> 
>   "the new clone will only contain the store (.hg) and no working copy"
> 
> would be more accurate. See [1]

While somewhat consistent usage would be good, I don't think we really 
need to enforce very strict terminology here. We use multiple terms for 
the same things sometimes, and that's okay.

Cheers,

Dirkjan