[issue5816] Simplify parsing of complex numbers and make complex('inf') valid.

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Committed to py3k, r71818, with the changes Eric suggested.  I ran build 
and tests both with and without the -DPY_NO_SHORT_FLOAT_REPR compiler 
option.

Will backport.

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versions: +Python 2.7 -Python 3.1

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