code: def _create_genome_regions(data):
      
      work_dir = utils.safe_makedir(os.path.join(dd.get_work_dir(data), "coverage", dd.get_sample_name(data)))
      variant_regions = os.path.join(work_dir, "target-genome.bed")
      with file_transaction(data, variant_regions) as tx_variant_regions:
          with open(tx_variant_regions, "w") as out_handle:
              for c in shared.get_noalt_contigs(data):
                  out_handle.write("%s\t%s\t%s\n" % (c.name, 0, c.size))
      return variant_regions
docs: Create whole genome contigs we want to process, only non-alts.
  
      Skips problem contigs like HLAs for downstream analysis.