Update functions to aid scripting, better b12 fix

- include Na, Nb, Nc in processHITRAN output
- part_swept result is written to Sweep.part_swept
- makeAbs function does not take HITRAN file argument, instead uses addHITRAN
to make hitline
- add spec_intensity function to ohcalcs
- better fix to b12 function that should work for arrays or scalars