[issue7117] Backport py3k float repr to trunk

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

+1 on backporting the 'f' and 'g' work also.
We will be well served by getting the two
code bases ins-sync with one another.

Eliminating obscure differences makes it easier
to port code from 2.x to 3.x

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<http://bugs.python.org/issue7117>
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