Use separate fdmrg objects for ground state and highest excited state when finding energy range
Use separate fdmrg objects for ground state and highest excited state when finding energy range


Former-commit-id: de4c3fc9359f39d7e7313e7941360a52414acf84
DavidAce/DMRG,DavidAce/DMRG,DavidAce/DMRG,DavidAce/DMRG