Fw: [ODE] auto-disable implemented (again)

[James Golding]

 > * When a body has remained a disable-candidate for certain number of
 > successive steps, it gets disabled.

>From experience, you may want to make this 'elapsed sim time' instead of
number of steps. Otherwise you can get quite different behaviour when the
timestep is different - for example things will turn off more readily if you
have a high frame rate or are running in slow-mo.

Just a thought!

James