[m-rev.] for review: specialize all calls to {string, io}.format

[Zoltan Somogyi]

On Sun, 30 Nov 2014 18:49:53 +1100 (EST), "Zoltan Somogyi" <zoltan.somogyi at runbox.com> wrote:
> I agree with your implicit point about this probably not being what
> users expect, so I will turn off optimize_format_calls when debugging
> is enabled. We could add yet another option to turn it on even in
> debugging grades, but I don't think there is much point in that.

This diff does the above.

Zoltan.

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