[patch] remove default diff prefix; support -p0 and -p1

[Michael Ellerman]

On 5/4/06, Martin Pool <mbp at sourcefrog.net> wrote:
> * change diffs back to not having path prefixes by default
> * you can specify them with 'diff --prefix OLD:NEW'
>   (note that this has changed from 'diff --diff-prefix', which seemed a bit
>    redundant)
> * you can also just say 'diff -p0' (gives the default) or 'diff -p1'

Looks good.

cheers