[issue1580] Use shorter float repr when possible

[Tim Peters]

Tim Peters added the comment:

[Raymond]
> ...
> NaNs in particular are a really
> difficult case because our equality testing routines
> have a fast path where identity implies equality.

Works as intended in 2.5; this is Windows output:

1.#INF
>>> nan = inf - inf
>>> nan  # really is a NaN
-1.#IND
>>> nan is nan  # of course this is true
True
>>> nan == nan  # but not equal anyway
False

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<http://bugs.python.org/issue1580>
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