- variable oldvan deleted. I think everything should work as before,
  because both Q functions and the Herman-Skillman grid are correctly
  computed in this case as well, but cannot check it. The old Vanderbilt
  format is anyway really old, dating back to 20 years or so.
- variable newpseudo merged into the upf% structure as upf%is_multiproj.
  I think I have reproduced exactly the previous behaviour but again
  cannot check it. I haven't checked the current logic (or lack thereof)
  of this variable, but a better logic would be to actually check whether
  the PP is multi-projector and in all cases (USPP and PAW as well as NCPP)