[patch] update of alexander's rmtree patch

[Alexander Belchenko]

Martin Pool пишет:
> This is an update of Alexander's patch posted last month to take account
> of shifts in bzr.dev.   Alexander, is there anything else you strongly
> want merged for 0.8?

This patch show that you want make this rmtree-read-only approach as
bzrlib default method. Well, probably you're right. So I'm strongly
positive for that.

Now I have not another urgent patches and willing to start to make win32
bzr.exe and installer.

--
Alexander