code: public static ParticleSystem loadConfiguredSystem(File ref)
  			throws IOException {
        return loadConfiguredSystem(new FileInputStream(ref), null, null, null);
  	}
docs: Load a set of configured emitters into a single system
  
  @param ref
  The XML file to read
  @return A configured particle system
  @throws IOException
  Indicates a failure to find, read or parse the XML file