[ODE] Autodisable defaults

[Colin Bonstead]

I was looking at the autodisable defaults that dWorldCreate uses, and it 
seems like there's a problem.  Here's what's in the code:

w->adis.linear_threshold = REAL(0.001)*REAL(0.001);
w->adis.angular_threshold = REAL(0.001)*REAL(0.001);
w->adis.idle_steps = 10;
w->adis.idle_time = 0;
w->adis_flag = 0;

So if a body has linear and angular velocity less than linear_threshold 
and angular_threshold for more than idle_steps or idle_time it will get 
disabled.  Idle_steps seems reasonable at 10, but idle_time is zero, 
which means bodies will get disabled the instant they drop below the 
thresholds.  Is this right?