[ODE] Performance patch : not checking collision between disabled bodies

[Nguyen Binh]

Hi Joe,

JA> Once that is working the performance optimization you propose will not be
JA> necessary anymore thus I think it could just as well be left out. (Aside
JA> from that you can do the same test inside near callback if you want to.)

    Agree! I just tried to convince people to put that culling in ODE
    core and there are many ways to do though.

    Your idea for this is very nice as it remove all overhead needed
    at each collision detection.
    
-- 
Best regards,

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   Nguyen Binh
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