[ODE] recent dSetZero() patch wrong?

[Nguyen Binh]

AP> It did make StepFast working incorrectly. The cause was in stepfast.cpp,
AP> around line 740: "dSetZero (J, 2 *
AP> m * 8);" shouldn't be commented out. I don't know the "meaning" of it, but
AP> it seems from the code that dSetZero is actually needed there...

    Yes, you are right! like *c, J is used as place holder for
    Jacobian sub matrices and it should be set to zero on initialize.


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