anchor.diff:          ! Decode determinant bit string into integer list containing the
           ! occupied orbitals.
           ! In:
  -        !    f(tot_string_len): bit string representation of the Slater
  -        !        determinant.
  +        !    sys: system being studied (contains required basis information).
  +        !    f(tot_string_len): bit string representation of the Slater
  +        !        determinant.
  +        !    excit_gen_data (optional): information for excitation generators.
           ! Out:
           !    d: det_info_t variable.  The following components are set:
           !        occ_list: integer list of occupied spin-orbitals in the
  
positive.code:         ! We return the lists for alpha and beta electrons separately.
          !
          ! In:
          !    f(tot_string_len): bit string representation of the Slater
          !        determinant.
          ! Out:
          !    d: det_info_t variable.  The following components are set:
          !        occ_list: integer list of occupied spin-orbitals in the
  
negative.code: 
          ! Decode determinant bit string into integer list containing the
          ! occupied orbitals and some weights for hbu excit gen.
          ! In:
          !    sys: system being studied (contains required basis information).
          !    f(tot_string_len): bit string representation of the Slater
          !        determinant.
          !    excit_gen_data (optional): information for excitation generators.
          ! Out:
          !    d: det_info_t variable.  The following components are set:
          !        occ_list: integer list of occupied spin-orbitals in the
  