Introducing a "UserException" class
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                 Key: MATH-440
                 URL: https://issues.apache.org/jira/browse/MATH-440
             Project: Commons Math
          Issue Type: Improvement
            Reporter: Gilles
            Assignee: Gilles
            Priority: Minor
             Fix For: 2.2


After a discussion in MATH-425, it was concluded that a new "UserException" 
could be created and advertised as a privileged channel to convey failure 
information through the CM code layer.
The usage of this exception is the same as the one intended for the current 
{{FunctionEvaluationException}}, {{MatrixVisitorException}} and 
{{DerivativeException}}, so those classes will be deprecated.


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