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

[Mark Dickinson]

Mark Dickinson added the comment:

Any reason not to make the name change?  Is further discussion/time 
required, or can we go ahead and rename Rational to Fraction and 
rational.py to fractions.py?  It seems like everybody's happy with the 
idea.

I note that the name change affects Lib/test/test_builtin.py as well as 
Doc/whatsnew/2.6.rst.  Any other non-obvious places that I've missed?

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