docs: def createMDSFile(nb_components, inPrefix, outPrefix, genomeFileName):
      """Creates a MDS file using Plink.
  
      :param nb_components: the number of component.
      :param inPrefix: the prefix of the input file.
      :param outPrefix: the prefix of the output file.
      :param genomeFileName: the name of the ``genome`` file.
  
      :type nb_components: int
      :type inPrefix: str
      :type outPrefix: str
      :type genomeFileName: str
  
      Using Plink, computes the MDS values for each individual using the
      ``inPrefix``, ``genomeFileName`` and the number of components. The results
      are save using the ``outPrefix`` prefix.
  
      """
      plinkCommand = ["plink", "--noweb", "--bfile", inPrefix, "--read-genome",
                      genomeFileName, "--cluster", "--mds-plot",
                      str(nb_components), "--out", outPrefix]
      runCommand(plinkCommand)