more solver experiments, randomize the order of contact points, not just manifolds

use #defines for constants, rather then const btScalar

src/BulletDynamics/Dynamics/btSimpleDynamicsWorld.cpp

@@ -194,4 +194,4 @@ void	btSimpleDynamicsWorld::setConstraintSolver(btConstraintSolver* solver)
 	}
 	m_ownsConstraintSolver = false;
 	m_constraintSolver = solver;
-}
+}