code: public static void saveConfiguredSystem(File file, ParticleSystem system)
  			throws IOException {
  		saveConfiguredSystem(new FileOutputStream(file), system);
  	}
docs: Save a particle system with only ConfigurableEmitters in to an XML file
  
  @param file
  The file to save to
  @param system
  The system to store
  @throws IOException
  Indicates a failure to save or encode the system XML.