Store a new quantity called
DFT.jacobs_ladder, which usurps the role of
DFT.xc_functional_type. The latter should be preserved for the GUI until after reprocessing.
Moreover, the actual value to be stored should match those shown in the GUI, i.e. LDA, GGA, Meta-GGA, Hyper-GGA, Hybrid. In the case of
GW.starting_point_type, HF is preserved.