[Python-3000] Implementing % formatting in terms of str.format()

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    >> Is there a 2-to-3 fixer for % format?  I scanned the fixes directly
    >> quickly but didn't see anything obvious.

    Benjamin> I believe the only reason that % is even in 3.0 is that a 2to3
    Benjamin> fixer couldn't be easily written for it.

I find that kind of hard to believe (that it should be terribly difficult to
write a fixer, at least given a % operator with a string literal LHS and
either a tuple or dict RHS or a call to locals() or globals()).

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