  lines
  Read molecular spectroscopic line parameters (Hitran, Geisa, ... extract)  and convert to new pressure/temperature

  usage:
  lines [options] line_parameter_file(s)

  -h          help
  -c char     comment character(s) used in input, output file (default '#')
  -o string   output file for saving of line data (if not given: write to StdOut)

  -m string   molecule (no default, should be given in the line file, required otherwise)
  -p float    pressure (in mb,  default: p_ref of linefile, usually 1013.25mb=1atm)
  -T float    Temperature (in K, default: T_ref of linefile, usually 296K)
  -x Interval lower, upper wavenumbers (comma separated pair of floats [no blanks!],
                                        default set according to range of lines in datafile)

  NOTES:
  in:  The line parameter file(s) should contain a list of (preselected) lines
       that can be generated from HITRAN or GEISA database with extract.py 
       i.e., the original HITRAN or GEISA data bases cannot be used as input files
       (See the documentation header of lbl2xs.py for more details)

  out: The output file(s) are formatted automatically according to the extension given for the output file(s):
       if the extension is vSL or vSLD or vSLG, then three or four columns with position, strengths, Lorentz (and Doppler) width are written
       otherwise, three columns with position and strengths at T_ref and T are written
       (actually there is a fourth column with zeros to facilitate plotting of delta S as (one sided) error bar)

