added a warning to all serialization structures:

///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64

src/BulletCollision/CollisionDispatch/btCollisionObject.h

@@ -432,9 +432,7 @@ public:
 
 };
 
-///using offsetof for m_vtablePadding might break some compilers, in that case define m_vtablePadding manually
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
-
-///for serialization
 struct	btCollisionObjectDoubleData
 {
 	void					*m_broadphaseHandle;
@@ -465,6 +463,7 @@ struct	btCollisionObjectDoubleData
 	char	m_padding[4];
 };
 
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct	btCollisionObjectFloatData
 {
 	void					*m_broadphaseHandle;

src/BulletCollision/CollisionShapes/btCapsuleShape.h

@@ -131,7 +131,7 @@ public:
 	
 };
 
-
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct	btCapsuleShapeData
 {
 	btConvexInternalShapeData	m_convexInternalShapeData;

src/BulletCollision/CollisionShapes/btCollisionShape.h

@@ -125,7 +125,7 @@ public:
 
 };	
 
-///for serialization
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct	btCollisionShapeData
 {
 	void	*m_userPointer;

src/BulletCollision/CollisionShapes/btCompoundShape.h

@@ -171,7 +171,7 @@ public:
 
 };
 
-
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct btCompoundShapeChildData
 {
 	btTransformFloatData	m_transform;
@@ -180,7 +180,7 @@ struct btCompoundShapeChildData
 	float					m_childMargin;
 };
 
-
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct	btCompoundShapeData
 {
 	btCollisionShapeData		m_collisionShapeData;

src/BulletCollision/CollisionShapes/btConvexHullShape.h

@@ -96,7 +96,7 @@ public:
 
 };
 
-
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct	btConvexHullShapeData
 {
 	btConvexInternalShapeData	m_convexInternalShapeData;

src/BulletCollision/CollisionShapes/btConvexInternalShape.h

@@ -118,7 +118,7 @@ public:
 	
 };
 
-
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct	btConvexInternalShapeData
 {
 	btCollisionShapeData	m_collisionShapeData;

src/BulletCollision/CollisionShapes/btCylinderShape.h

@@ -159,7 +159,7 @@ public:
 
 };
 
-
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct	btCylinderShapeData
 {
 	btConvexInternalShapeData	m_convexInternalShapeData;

src/BulletCollision/CollisionShapes/btStaticPlaneShape.h

@@ -66,6 +66,7 @@ public:
 
 };
 
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct	btStaticPlaneShapeData
 {
 	btCollisionShapeData	m_collisionShapeData;

src/BulletCollision/CollisionShapes/btStridingMeshInterface.h

@@ -109,6 +109,7 @@ struct	btShortIntIndexData
 	short int	m_value;
 };
 
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct	btMeshPartData
 {
 	btVector3FloatData			*m_vertices3f;
@@ -121,6 +122,7 @@ struct	btMeshPartData
 };
 
 
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct	btStridingMeshInterfaceData
 {
 	btMeshPartData	*m_meshPartsPtr;

src/BulletCollision/CollisionShapes/btTriangleMeshShape.h

@@ -88,7 +88,7 @@ public:
 
 };
 
-
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct	btTriangleMeshShapeData
 {
 	btCollisionShapeData	m_collisionShapeData;

src/BulletDynamics/ConstraintSolver/btConeTwistConstraint.h

@@ -264,6 +264,7 @@ public:
 
 };
 
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct	btConeTwistConstraintData
 {
 	btTypedConstraintData	m_typeConstraintData;

src/BulletDynamics/ConstraintSolver/btGeneric6DofConstraint.h

@@ -507,6 +507,7 @@ public:
 	
 };
 
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct btGeneric6DofConstraintData
 {
 	btTypedConstraintData	m_typeConstraintData;

src/BulletDynamics/ConstraintSolver/btHingeConstraint.h

@@ -240,6 +240,7 @@ public:
 
 };
 
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct	btHingeConstraintDoubleData
 {
 	btTypedConstraintData	m_typeConstraintData;
@@ -258,7 +259,7 @@ struct	btHingeConstraintDoubleData
 	float	m_relaxationFactor;
 
 };
-
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct	btHingeConstraintFloatData
 {
 	btTypedConstraintData	m_typeConstraintData;

src/BulletDynamics/ConstraintSolver/btPoint2PointConstraint.h

@@ -112,6 +112,7 @@ public:
 
 };
 
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct	btPoint2PointConstraintFloatData
 {
 	btTypedConstraintData	m_typeConstraintData;
@@ -119,6 +120,7 @@ struct	btPoint2PointConstraintFloatData
 	btVector3FloatData	m_pivotInB;
 };
 
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct	btPoint2PointConstraintDoubleData
 {
 	btTypedConstraintData	m_typeConstraintData;

src/BulletDynamics/ConstraintSolver/btSliderConstraint.h

@@ -239,6 +239,7 @@ public:
 
 };
 
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct btSliderConstraintData
 {
 	btTypedConstraintData	m_typeConstraintData;

src/BulletDynamics/ConstraintSolver/btTypedConstraint.h

@@ -282,7 +282,7 @@ SIMD_FORCE_INLINE btScalar btAdjustAngleToLimits(btScalar angleInRadians, btScal
 	}
 }
 
-
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct	btTypedConstraintData
 {
 	btRigidBodyData		*m_rbA;

src/BulletDynamics/Dynamics/btRigidBody.h

@@ -513,7 +513,7 @@ public:
 };
 
 //@todo add m_optionalMotionState and m_constraintRefs to btRigidBodyData
-///btRigidBodyData is used for btRigidBody serialization
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct	btRigidBodyFloatData
 {
 	btCollisionObjectFloatData	m_collisionObjectData;
@@ -539,6 +539,7 @@ struct	btRigidBodyFloatData
 	int						m_additionalDamping;
 };
 
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
 struct	btRigidBodyDoubleData
 {
 	btCollisionObjectDoubleData	m_collisionObjectData;