[ODE] eliminating all state

[Martin C. Martin]

> The message from which you are being indirectly quoted is:
> 
> http://q12.org/pipermail/ode/2002-April/001107.html

Thanks Norman, I see where he says it's only positions and velocities.

For those who are curious, I found the source of the problem: when I was
printing out my doubles, I was only printing DBL_DIG many digits (= 15). 
It turns out, I need to print out 17 digits to be sure the values when
read in are exactly the same as before.

Thanks,
Martin