add a comment in gamestatus.hpp

src/gamestatus.hpp

@@ -237,6 +237,9 @@ public:
 	std::vector<std::string> campaign_xtra_defines;  /**< more customization of data */
 
 	std::string campaign;                            /**< the campaign being played */
+	//'history' is currently not referenced outside of gamestatus.cpp
+	//also in every savefile i saw is history=""
+	//TODO: can we delete it ?
 	std::string history;                             /**< ancestral IDs */
 	std::string abbrev;                              /**< the campaign abbreviation */
 //	std::string scenario;                            /**< the scenario being played */