[issue17449] dev guide appears not to cover the benchmarking suite

[Antoine Pitrou]

Antoine Pitrou added the comment:

> * Using "-b 2n3" instead instead of "-b default" or "-b all" works,
> but
>   runs only a subset of the benchmark.

I think we should include a copy of the 2to3'ed third-party libs in
the benchmarks repo, this would running avoid the length and tedious
conversion on every user's computer.

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<http://bugs.python.org/issue17449>
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