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

[Mark Dickinson]

Mark Dickinson added the comment:

I noticed that the ability to type Rational("2.3") has been added (and I 
think this is a very useful addition).  One minor nit:  would it make 
sense to have Rational("2.") and Rational(".3") also work?  These strings 
work for float() and Decimal(), and 2. and .3 work as float literals, so 
it would seem to make sense to allow this for Rational as well.

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