docs: def add_headers(vcf_obj, nr_cases=None, sv=False):
      """Add loqus specific information to a VCF header
  
      Args:
          vcf_obj(cyvcf2.VCF)
      """
  
      vcf_obj.add_info_to_header(
          {
              'ID':"Obs",
              'Number': '1',
              'Type': 'Integer',
              'Description': "The number of observations for the variant"}
      )
      if not sv:
          vcf_obj.add_info_to_header(
              {
                  'ID':"Hom",
                  'Number': '1',
                  'Type': 'Integer',
                  'Description': "The number of observed homozygotes"}
          )
          vcf_obj.add_info_to_header(
              {
                  'ID':"Hem",
                  'Number': '1',
                  'Type': 'Integer',
                  'Description': "The number of observed hemizygotes"}
          )
      if nr_cases:
          case_header = "##NrCases={}".format(nr_cases)
          vcf_obj.add_to_header(case_header)
      # head.add_version_tracking("loqusdb", version, datetime.now().strftime("%Y-%m-%d %H:%M"))
      return