[MERGE] Fast _walkdirs for win32

[Adrian Wilkins]

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> Ian Clatworthy wrote:

> | Please ping others (spiv and/or markh say) familiar with pyrex and
> | the win32 API used to review the code in bzrlib/_walkdirs_win32.pyx.
> | The rest is fine, assuming we only need to handle files and dirs at
> | this level. (I gather symlinks and tree references are handled higher
> | up the stack.)
> 
> Windows filesystems can't have symlinks, and tree references are indeed
> handled higher up the stack.
> 

Not strictly true ; NTFS 6 (Vista, 2k8) supports symlinks, although I'd hardly
call them a mainstream feature. I'm not sure how well they'd be supported by the
current Python libraries even if we made a special effort to use them.

NTFS 5 supports something called "junctions" which are link-ish but only work on
directories.

> |
> | bb: comment
> |
> | (This is actually a tweak vote assuming someone else reviews the pyx
> | file as mentioned. I'm making it 'comment' so BB doesn't take it off
> | the queue for other reviewers just yet.)
> |
> | Ian C.
> |
> 

I'm looking at the pyx, but I have never written any pyx myself, so my ability
to review it is pretty much limited to making sure there are no huge gaffes with
regard to the windows API. They'd have to be huge for me to spot them.

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