message: Finally whole system compiling somehow.
diff: @@ -54,6 +54,14 @@ int System::extendTo(State& state_from_in, State& state_towards_in,
  return 1;
  }
  +int System::getStateKey(State& state_in, double* state_key) {
  + for (int i = 0; i < getNumDimensions(); i++) {
  + state_key[i] = state_in[i];
  + }
  +
  + return 1;
  +}
  +
  double System::evaluateExtensionCost(State& state_from_in,
  State& state_towards_in,
  bool& exact_connection_out) {
  