code: def generate_tsv_pep_protein_quants(fns):
      
      for fn in fns:
          header = get_tsv_header(fn)
          for pquant in generate_split_tsv_lines(fn, header):
              yield os.path.basename(fn), header, pquant
docs: Unlike generate_tsv_lines_multifile, this generates tsv lines
      from multiple files that may have different headers. Yields
      fn, header as well as quant data for each protein quant