[MERGE] Diff now emits files in alphabetical order

[Aaron Bentley]

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Hi all,

Here's an update to diff that causes it to emit files in alphabetical
order, instead of grouping them by change kind.

The performance difference seems negligible:

Old: (best of 3)
real    0m3.421s
user    0m3.172s
sys     0m0.192s

New: (best of 3)
real    0m3.622s
user    0m3.256s
sys     0m0.236s

So the new version is 1.05x slower than as the old version.  But since
it uses iter_changes directly, it also opens the door to further
performance enhancements.

Aaron
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