docs: def checkNumberOfSNP(fileName, minimumNumber):
      """Check there is enough SNPs in the file (with minimum).
  
      :param fileName: the name of the file.
      :param minimumNumber: the minimum number of markers that needs to be in the
                            file.
  
      :type fileName: str
      :type minimumNumber: int
  
      :returns: ``True`` if there is enough markers in the file, ``False``
                otherwise.
  
      Reads the number of markers (number of lines) in a file.
  
      """
      nbSNP = 0
      try:
          with open(fileName, 'r') as inputFile:
              for line in inputFile:
                  nbSNP += 1
      except IOError:
          msg = "{}: no such file".format(fileName)
          raise ProgramError(msg)
  
      if nbSNP < minimumNumber:
          return False
      return True