add support for double precision and 64bit serialization (and compatibility between all versions)

fix some issue in serialization of nested array data
add some tesing files

src/BulletDynamics/Character/btKinematicCharacterController.h

@@ -67,7 +67,7 @@ protected:
 
 	bool	m_useGhostObjectSweepTest;
 	bool	m_useWalkDirection;
-	float	m_velocityTimeInterval;
+	btScalar	m_velocityTimeInterval;
 	int m_upAxis;
 	
 	btVector3 computeReflectionDirection (const btVector3& direction, const btVector3& normal);