patch parameterisation: was [PD] abstractions which have their own memory

[Thomas Grill]

>
> As soon as I've decided on the final interface of the ODE-Pd-object I
> guess I will try, if moving from Python to C++ will give a substantial
> performance boost. Though I doubt it will.

I doubt too. Most of the time in PyODE is spent in collision detection 
inside the ODE library, very little in the Python interface.

greetings,
Thomas