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

[Mark Dickinson]

Mark Dickinson added the comment:

Nick Coghlan wrote:
> I mentioned my dislike of the classmethod->staticmethod change on the
> python-checkins list, but given the lack of response there, I figure I
> should bring it up here.

Yes, I missed it.  Apologies.  I'll rethink this (and likely-as-not 
revert it, but I want to get my head around the issues first).

One problem I'm having is imagining any real-life examples of subclasses 
of Rational.  An example or two might help inform the discussion.

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