init methods for event handler and stap handler in ODE
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                 Key: MATH-714
                 URL: https://issues.apache.org/jira/browse/MATH-714
             Project: Commons Math
          Issue Type: Improvement
    Affects Versions: 2.1
            Reporter: Luc Maisonobe
            Assignee: Luc Maisonobe
            Priority: Minor
             Fix For: 3.0


The EventHandler interface does not provide any way to initialize the step 
handler at integration start.
The StepHandler interface does have this feature, but it uses a confusing name 
(reset) which can easily be confused with the resetState method of the 
EventHandler interface despite it has nothing to do with events based resets.

Both interfaces being often used together, it would be nice to have an init 
method in both interfaces, with arguments t0, y0 and t representing the 
integration boundaries. The init method would simply replace the reset method 
in the StepHandler interface and it would be a new method in the EventHandler 
interface.

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