code: public void unlinkAll(ParaObject obj) {
  		if (obj == null || obj.getId() == null) {
  			return;
  		}
  		String url = Utils.formatMessage("{0}/links", obj.getObjectURI());
  		invokeDelete(url, null);
  	}
docs: Unlinks all objects that are linked to this one.
  @param obj the object to execute this method on
  Only {@link com.erudika.para.core.Linker} objects are deleted.
  {@link com.erudika.para.core.ParaObject}s are left untouched.