[MERGE REVIEW] fixes for cmd_diff and checkouts

[Aaron Bentley]

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John Arbash Meinel wrote:
> Did you not get my other email? I basically gave you a +1, but was
> concerned about some of the function and parameter names.

No, I didn't get that (at all, according to my logs).  I seem to have
missed some mail from around that time you were having server problems.
 Could you resend please?

Aaron
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