Provide initial guess for SCF step

Lines 50 to 56 in 2ac67ac

    
           def energy_elec_nc(mf: RDFDH, mo_coeff=None, h1e=None, vhf=None, **_): 
        
               if mo_coeff is None: 
        
                   if mf.mf_s.e_tot == 0: 
        
                       mf.run_scf() 
        
                       if mf.xc_n is None:  # if bDH-like functional, just return 
572A
SCF energy 
        
                           return mf.mf_s.e_tot - mf.mf_s.energy_nuc(), None 
        
                   mo_coeff = mf.mf_s.mo_coeff

Since kwargs are not passed to run_scf, so currently it's not possible to pass initial guess, is it?

So I'm wondering which solution is preferred: allow users passing dm0 in as kwargs, or encourage users running mf.mf_s manually after DH initialized?

An even more flexible implementation could be allow initializing upon mf_or_mol, like

https://github.com/pyscf/pyscf/blob/0785373fb5f11105bc41743565cf4b7e13464c92/pyscf/mcscf/casci.py#L779

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	def energy_elec_nc(mf: RDFDH, mo_coeff=None, h1e=None, vhf=None, **_):
	if mo_coeff is None:
	if mf.mf_s.e_tot == 0:
	mf.run_scf()
	if mf.xc_n is None: # if bDH-like functional, just return 572A SCF energy
	return mf.mf_s.e_tot - mf.mf_s.energy_nuc(), None
	mo_coeff = mf.mf_s.mo_coeff

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