[PATCH] fix core library string formatting for python 2.6

[Douglas Bagnall]

> I will do the tests in another patch.

Here.

Please review with a bit of care: *one* way in which Python's .format()
is inferior to its % printf formatting is there is no error for
unconsumed arguments. That is, if I went:

-    "{} {} {}".format(x, y, z)
+    "{0} {1} {1}".format(x, y, z)

there would be no error to say I had ignored the third argument.
So you need to review my ability to count.

cheers,
Douglas
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