[MERGE] Use win32file.FindFiles instead of os.lstat when available

[John Arbash Meinel]

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Attached is an optional optimizer when running on windows. I was working
in a moderately sized tree (~9k files+dirs), and I noticed that "bzr
status" was a bit slower than I would have expected. When I did
- --lsprof, all the time was taken in "nt.lstat". I checked around and saw
that pywin32 exposes the FindFiles api, which will return the directory
entries and their stat info as you go.

In my testing, it makes things faster. Somewhere between 2-4x for the
time spent it walkdirs. It also seems to do interesting things with
caching. Because after I've run status with this code a couple of times,
it makes the plain "bzr status" faster, though still not as fast.

Anyway, abstractions are great, as this lets me slip in a more optimized
version for walking win32 paths. (And yes, this shouldn't be my primary
focus, but it was getting in my way and I wanted it to be better.)

John
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