[issue1682] Move Demo/classes/Rat.py to Lib/rational.py and fix it up.

[Raymond Hettinger]

Raymond Hettinger added the comment:

FWIW, I'm -1 on moving this module to the standard library.  There has 
been basically *zero* demand for something like this.  Because rational 
implementations seem to be more fun to write than to use, I think there 
are some competing implementations.

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nosy: +rhettinger

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