message: Fix Python2 compatibility
diff: @@ -49,7 +49,7 @@ def read_lower_triangular_matrix_from_csv_file(csv_file='', separator=';'):
  """
  if csv_file is not '':
  if os.path.isfile(csv_file):
  - return read_matrix_from_csv_file(str.encode(csv_file), str.encode(separator)[0])
  + return read_matrix_from_csv_file(str.encode(csv_file), ord(separator[0]))
  print("file " + csv_file + " not set or not found.")
  return []
  