[MERGE] fix upwalk for UNC path (was: Re: [rfc] win32 UNC path: problem with transport.clone('..'))

[Robert Collins]

Robert Collins has voted +1 (conditional).
Status is now: Conditionally approved
Comment:
If you rename Win32LocalTransport to EmulatedWin32LocalTransport, this 
has my +1. The rename is to make it more clear what is going on.

For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3Cepkbfg%24h72%241%40sea.gmane.org%3E