code: protected void initTile (Tile tile, int tileIndex, Colorization[] zations)
      {
          if (_improv != null) {
              tile.setImage(getTileMirage(tileIndex, zations));
          }
      }
docs: Initializes the supplied tile. Derived classes can override this method to add in their own
  tile information, but should be sure to call <code>super.initTile()</code>.
  
  @param tile the tile to initialize.
  @param tileIndex the index of the tile.
  @param zations the colorizations to be used when generating the tile image.