Solver model speeds

[hpesoj]

Hmm, so NewtonSetFrictionModel is actually obsolete? Surely you would never want to use the exact solver plus adaptive friction? The 10% increase in speed would only really matter in games, which would be using the linear solver anyway.

I have updated the wiki for NewtonSetSolverModel and NewtonSetFrictionModel with what is my understanding of what you have said.