Causes of randomness

[tatt61880]

I think there are many causes for randomness/non-determinism of Algoodoo.
It can be useful for developer to list up them all in this topic, in my humble opinion.

== Not yet fixed ==
2.0.1 entityID and geomID
2.0.2b15 Non-determinism with hinged objects
2.0.2b15 Moving a geom moves other geom (body=0)
1.8.4 tracers tail disappear <-This may be nothing to do with physics randomness.

== Fixed! ==
[Fixed]1.8.0 Simulation changes by undoing
[Fixed]2.0.0 Spring damping value issue.
[Fixed]2.0.2b14 Undo-ing changes vel/angvel ( Fixed in v2.0.2 b15 )
[Fixed]2.0.2b15 Undoing changes info (penetration related) ( Fixed in v2.1.0b4 )

[tatt61880]

I've updated the list.