[MERGE] Tweak diff --using

[Aaron Bentley]

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Hi all,

Here are some tweaks for diff --using:
1. When writing files, it sets the mtime, so that programs that read the
mtime (e.g. /usr/bin/diff) use the correct value.
2. Temporary files are set as readonly, to discourage editing them in
programs like vimdiff, and osutils.rmtree is used so that the readonly
files are deleted on win32.
3. When using trees that have a filesystem location (i.e. working
trees), and if symlinks are supported, creates a symlink to that tree
instead of creating new copies of its files.  This makes it possible to
use gvimdiff and edit the new file.
4. The path parameter is provided to Tree.get_file.

Aaron

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