code: @Nonnull
    public PLTable addRow (@Nonnull final Iterable <? extends PLTableCell> aCells)
    {
      return addRow (aCells, m_aRows.getDefaultHeight ());
    }
docs: Add a new table row with auto height. All contained elements are added with
  the specified width in the constructor. <code>null</code> elements are
  represented as empty cells.
  
  @param aCells
  The cells to add. May not be <code>null</code>.
  @return this