FractionFormat should extend NumberFormat
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                 Key: MATH-189
                 URL: https://issues.apache.org/jira/browse/MATH-189
             Project: Commons Math
          Issue Type: Improvement
    Affects Versions: 1.2
            Reporter: Matt Benson
             Fix For: 2.0


Marked as 2.0; whenever this is done it can only be done with JDK5 
compatibility without breaking the current API as certain methods that return 
Number in NumberFormat are defined (independently) in FractionFormat as 
returning Fraction.  JDK5's ability to narrow return types will sidestep what 
is currently a barrier.

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