SubsystemImpl(Signet signet, String id, String name, String helpText, Status status)
public SubsystemImpl()
  SubsystemImpl(Signet signet, String id, String name, String helpText,      Status status)  {    super(signet, id, name, status);    this.helpText = helpText;    this.categories = new HashSet();    this.functions = new HashSet();    this.choiceSets = new HashSet();        this.limits = new HashMap();    this.permissions = new HashMap();  }