[ODE] Precision specific functions

[Jason Perkins]

A while back, there was a brief discussion about introducing
OpenGL-style precision specific methods to ODE. That is, *in addition
to* the existing dBodyGetPosition() there would be:

  void dBodyGetPositionf(dBodyID body, float* pos);
  void dBodyGetPositiond(dBodyID body, double* pos);

The purpose of this is to ease integration with third-party code. Is
there a general interest in this approach, or will it just clutter up
the API?

Jason