code: @Nonnull
    @ReturnsMutableCopy
    public ICommonsList <ICommonsList <String>> readAll () throws IOException
    {
      final ICommonsList <ICommonsList <String>> ret = new CommonsArrayList <> ();
      while (m_bHasNext)
      {
        final ICommonsList <String> aNextLineAsTokens = readNext ();
        if (aNextLineAsTokens != null)
          ret.add (aNextLineAsTokens);
      }
      return ret;
    }
docs: Reads the entire file into a list with each element being a list of
  {@link String} of tokens.
  
  @return a list of list of String, with each inner list of {@link String}
  representing a line of the file.
  @throws IOException
  if bad things happen during the read