friend std::ostream& operator<<(std::ostream & str, const SolutionAction & action)
{ return action.dumpOn (str); }
friend std::ostream& operator<<(std::ostream & str, const SolutionActionList & actionlist);
friend std::ostream& operator<<(std::ostream & str, const SolutionAction & action)
{ return action.dumpOn (str); }
friend std::ostream& operator<<(std::ostream & str, const SolutionActionList & actionlist);