[issue2772] Add PendingDeprecationWarning for % formatting

[Eric Smith]

Eric Smith <eric at trueblade.com> added the comment:

Right.  But is it worth adding per-thread machinery to this?  I was
going to do that, but it seemed like overkill.  Upon further reflection,
however, I think you may be right.

I'll remove the "easy" keyword!

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keywords:  -easy

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