12.2.1

• Bugfix: the velocities used to calculate deltaRotation are inaccurate
• Bugfix: wheel rotation grows without bound, leading to roundoff errors
• Bugfix: damping is applied incorrectly to deltaRotation
• Increased customization of the right/forward/up axes of a vehicle chassis.
• Added double-precision accessors for the gravity vectors of rigid bodies.
• Added the Comparable interface to the IntPair class.
• Upgraded the Bullet sources to match SHA1 ID=ce2627192 of the bullet3 project.