code: public Tile getTile (int tileIndex, Colorizer rizer)
      {
          return getTile(tileIndex, getColorizations(tileIndex, rizer));
      }
docs: Creates a {@link Tile} object from this tileset corresponding to the specified tile id and
  returns that tile. A null tile will never be returned, but one with an error image may be
  returned if a problem occurs loading the underlying tileset image.
  
  @param tileIndex the index of the tile in the tileset. Tile indexes start with zero as the
  upper left tile and increase by one as the tiles move left to right and top to bottom over
  the source image.
  @param rizer an entity that will be used to obtain colorizations for tilesets that are
  recolorizable. Passing null if the tileset is known not to be recolorizable is valid.
  
  @return the tile object.