code: def print_header(self):
          
          lines_to_print = []
          lines_to_print.append('##fileformat='+self.fileformat)
          if self.filedate:
              lines_to_print.append('##fileformat='+self.fileformat)
              
          for filt in self.filter_dict:
              lines_to_print.append(self.filter_dict[filt])
          for form in self.format_dict:
              lines_to_print.append(self.format_dict[form])
          for info in self.info_dict:
              lines_to_print.append(self.info_dict[info])
          for contig in self.contig_dict:
              lines_to_print.append(self.contig_dict[contig])
          for alt in self.alt_dict:
              lines_to_print.append(self.alt_dict[alt])
          for other in self.other_dict:
              lines_to_print.append(self.other_dict[other])
          lines_to_print.append('#'+ '\t'.join(self.header))
          return lines_to_print
docs: Returns a list with the header lines if proper format