[MERGE] add modification dates to diff output, get rid of /dev/null (bug #43033)

[Aaron Bentley]

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John A Meinel wrote:
> James Henstridge wrote:

> I just wanted to discuss briefly if we really want the times to be
> shown. It seems to be adding a lot of clutter. And after what happened
> with -p1 diffs, I would like to see us be careful about what we add to
> the 'diff' output.


> The code changes themselves look clean, and the test cases look
> sufficient. So if we decide we really do want the timestamps, you have
> my +1.

I don't care either way.  I agree that the code looks reasonable, *if*
we decide we want to show timestamps.

Aaron
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