Some Failed ACI-DSRG Combinations

[lcyyork]

I modified aci-14 test case and found the following sci_excited_algorithm may not work with state-averaged DSRG at the moment.

The input:

molecule C2{
C  0.00000 0.00000 0.0
C  0.00000 0.00000 1.24253
}

set {
  basis 6-31g*
  scf_type pk
  e_convergence 13
  d_convergence 12
  r_convergence 12
  docc [2,0,0,0,0,2,1,1]
  guess gwh
}

set forte {
  active_space_solver aci
  frozen_docc [2,0,0,0,0,0,0,0]
  restricted_docc [0,0,0,0,0,0,0,0]
  active [1,0,1,1,0,3,2,2]
  sci_excited_algorithm ALGORITHM
  sigma 0.001
#  nroot 2
#  aci_n_average 2
  charge 0
  root_sym 0
  sci_preiterations 2
  dl_maxiter 100
  SCI_SAVE_FINAL_WFN true
  correlation_solver dsrg-mrpt2
  calc_type sa
  avg_state [[0,1,2]]
}

Escf, wfn = energy('scf', return_wfn=True)
energy('forte', ref_wfn=wfn)

ROOT_COMBINE: seg fault due to empty final_wfn_.
ROOT_ORTHOGONALIZE: this runs but the energy is wrong: the DSRG reference energy is not equal to the averaged energy from ACI. May need to set the eigenvectors and set of determinants from old_roots_.