Transmit optional svd_threshold when moving the center position along the chain
Transmit optional svd_threshold when moving the center position along the chain


Former-commit-id: b25f4bde5dcf0a3d96d65c68a9bc84416e38a3af
DavidAce/DMRG,DavidAce/DMRG,DavidAce/DMRG,DavidAce/DMRG