[ODE] motionX and auto-disable

[Geoff Carlton]

Just spend some time on a little gotcha.

If you are using a moving world using the { motion1, motion2, motionN } 
parameters of a surface, objects can be autodisabled and not turned back 
on properly (considering the world is effectively moving).  In my case, 
I now check the 3 parameters and if they are set, I forceably enable the 
body when adding the contact.

Geoff