1. add b2Joint.GetType()
1. add b2Joint.GetAnchorA()
1. add b2Joint.GetAnchorB()
 - move bodyA/bodyB into b2Joint as source C does it.
 - add GetReactionForce()
 - add GetReactionTorque()
 - add IsActive()
 - add GetCollideConnected()

make up  b2DistanceJoint methods

make up b2FrictionJoint methods

make up b2GearJoint methods.

make up b2MtorJoint methods

make up b2MouseJoint methods

 make up b2PrismaticJoint methods

make up b2PulleyJoint methods

make up b2RevoluteJoint methods

make up b2RopeJoint methods

add limit_state enums

make up b2WeldJoint methods

make up b2WheelJoint methods

change indents to 2 spaces

void b2Body_SetLinearDamping(void* body, double linearDamping);
double b2Body_GetLinearDamping(void* body);
void b2Body_SetAngularDamping(void* body, double angularDamping);
double b2Body_GetAngularDamping(void* body);
bool b2Body_IsAwake(void* body);
void b2Body_SetBullet(void* body, double flag);
bool b2Body_IsBullet(void* body);
void b2Body_SetSleepingAllowed(void* body, double flag);
bool b2Body_IsSleepingAllowed(void* body);
void b2Body_SetActive(void* body, double flag);
bool b2Body_IsActive(void* body);
bool boBody_IsFixedRotation(void* body);