rem: virtual string parameter_names(void) const { return("peak-limit-%,release-time-sec,fast-crate,overall-crate"); }
add: virtual std::string parameter_names(void) const { return("peak-limit-%,release-time-sec,fast-crate,overall-crate"); }
context:   virtual string parameter_names(void) const { return("peak-limit-%,release-time-sec,fast-crate,overall-crate"); }