docs: def get_individual_positions(individuals):
      """Return a dictionary with individual positions
  
      Args:
          individuals(list): A list with vcf individuals in correct order
  
      Returns:
          ind_pos(dict): Map from ind_id -> index position
      """
      ind_pos = {}
      if individuals:
          for i, ind in enumerate(individuals):
              ind_pos[ind] = i
      return ind_pos