Some code rearrangement (mainly line breaks).
Added a new option, "-n_sckpts_to_skip", to allow the user to skip the first n_sckpts_to_skip KPOINTS fount in the wavefunction file. This can be useful, for instance, together with hybrid functional calculations using VASP. I gratefully acknowledge JiangLong Wang, from Hebei University, for having suggested this feature and helped with several tests.