Specifies which stage of the unfolding tool to use
Options:
unfold_setup:
Writes the list of k-points corresponding to the path specified by UnfoldKPointPath.
This list of k-point (unfold_kpt.dat) must be used for an unocc calculation of the supercell,
adding the line "include 'unfold_kpt.dat'" to the inp file and removing the KPointGrid information.
unfold_run:
Perform the actual unfolding, based on the states obtained from the previous unocc run.