[issue1580] Use shorter float repr when possible

[Guido van Rossum]

Guido van Rossum added the comment:

> If I were in that situation I would prefer to store the binary
> representation. But if someone really needs to store decimal floats,
> we can add a method "fast_repr" which always calculates 17 decimal
> digits.

They can just use "%.17g" % x

> Decimal to binary conversion, in any case, shouldn't be slower than it
> is now, since on Gnu it is done anyway, and I don't think that our
> implementation should be much slower.

Sure.

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