code: public void createBundle (
          TileSetIDBroker idBroker, File bundleDesc, String targetPath)
          throws IOException
      {
          createBundle(idBroker, bundleDesc, new File(targetPath));
      }
docs: Creates a tileset bundle at the location specified by the
  <code>targetPath</code> parameter, based on the description
  provided via the <code>bundleDesc</code> parameter.
  
  @param idBroker the tileset id broker that will be used to map
  tileset names to tileset ids.
  @param bundleDesc a file object pointing to the bundle description
  file.
  @param targetPath the path of the tileset bundle file that will be
  created.
  
  @exception IOException thrown if an error occurs reading, writing
  or processing anything.