Enable PGN save (slow for now so do not use it).

src/base_tab/gamebase/PGNGameBase.hpp

@@ -10,6 +10,10 @@ public:
   PGNGameBase(std::string pgn_file);
   Game *GetGame(std::uint32_t id);
   bool NextGame();
+  Game *GetCurrentGame();
   std::string GetTag(std::string tag);
+  void Save(std::vector<std::uint32_t> to_ignore,
+            std::vector<GameBase *> new_games_bases,
+            std::vector<Game *> new_games);
   void Reset();
 };