win32 path patch

[Fredrik Lundh]

Simon Ekstrand wrote:

>> OK, I've put in a modified version of this.  Please test it and let me
>> know.
>
> bzr selftest still fails in windows due to separator issues, things
> like:
>
> Expected:
>    'src/wibble/wibble.c'
> Got:
>    'src\\wibble\\wibble.c'
>
> I'm unsure how it could be fixed considering how the tests are implemented
> though.

another approach would be to do things the other way: translate from os.sep to "/" on
the "way in", use "/" on the inside, and map back to os.sep only when needed (which
is never, on contemporary platforms).

</F>