class SolarSystem: public ZNode, public ODECrawlerMaster, public TimeMakerClient

 Simple simulation of a most unrealistic solar system.

 The integration of the system can be performed in two modes.

 1) ChunkedStorage

    The integrator runs in a separate thread and stores the results
    for given past/future in the storage map (see members mKeepPast
    and mCalcFuture). The time can be selected from outside by
    calling SetTime().

 2) DirectStep

    The calculation is performed on each TimeTick and results are
    put directly back into the CosmicBalls. There is no way to set
    the time otherwise.

 Do NOT change the mode after the processing has started ... or you
 will be sorry. Anyway ... they require a completely different setup
 for an efficient update-render loop.



 Notes for further development


 Collisions are not handled at all. Tried repulsive force on proximity but
 it didn't conserve energy (balls got shot out of the system). This could be
 fixed / hacked, of course.

 One could also change R, M of colliding balls ... and modify the velcoities
 accordingly. Also, fragmentation would be an option. The coolest thing
 would be to have moon formation.
 1. R, M could be intergration variables ... hmmh ... tricky.
 2. Keep some empty ball-slots for collisions / fragmentations.
 3. Big / gas giants could swallow the impactor.