add option to create mp4 videos from App_AllBullet2Demos, using the

--mp4=video.mp4 note that you have to re-convert for Quicktime
ffmpeg  -f mp4 -vcodec h264 -i test.mp4 -pix_fmt yuv420p test2.mp4
add the option to display text in 3d, used in Coriolis demo

src/BulletDynamics/Dynamics/btRigidBody.cpp

@@ -434,9 +434,8 @@ if (dInvertMatrix3(itInv, Itild) != 0) {
 	}
 #endif
 	btVector3 tau0 = Itild * L;
-	printf("tau0 = %f,%f,%f\n",tau0.x(),tau0.y(),tau0.z());
+//	printf("tau0 = %f,%f,%f\n",tau0.x(),tau0.y(),tau0.z());
 	return tau0;
-	return btVector3(0, 0, 0);
 }
 
 btVector3 btRigidBody::computeGyroscopicImpulseImplicit_Ewert(btScalar step) const