[m-rev.] for post-commit review: specialize calls to stream.string_writer.format

[Zoltan Somogyi]

As discussed before, this replaces calls to stream.string_writer.format
with code that implements the optimized version of string.format, and
then calls stream.put on the formatted string.

Does anyone (YesLogic, maybe?) have any code that uses stream.string_writer.format heavily enough that its performance
is important? If yes, then I could try translating these calls the other way,
calling put on each component of the formatted string as soon as it has been
formatted, and see if that is faster. It should only take an hour or two of work.

Zoltan.
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