fix recv() issue for raw vectors
fix recv() issue for raw vectors

wrathematics/pbdMPI,RBigData/pbdMPI,snoweye/pbdMPI,snoweye/pbdMPI,wrathematics/pbdMPI,wrathematics/pbdMPI,snoweye/pbdMPI,RBigData/pbdMPI,wrathematics/pbdMPI,RBigData/pbdMPI