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

[Zoltan Somogyi]

On Fri, 21 Nov 2014 10:59:45 +1100 (EST), "Zoltan Somogyi" <zoltan.somogyi at runbox.com> wrote:
> For review by anyone.

Is anyone intending to do a review? If not, I would like
to commit this.

Zoltan.