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

[Raymond Hettinger]

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

+1 on removing the L. Also, it would be nice if reduced fractions were 
restored to ints after the gcd step:

>>> Fraction(1*10**18, 3*10**18)
Fraction(1L, 3L)

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