Fix multiple inconsistencies when saving (#550)

* debug_leave_town use same logic as normal town exit. fix #549
* Standardize all save party code paths

Fix #480
Fix #204
Fix #267

* remove file_in_mem now that it is redundant
* Print message when save file not chosen

src/game/boe.actions.hpp

@@ -20,7 +20,7 @@ bool handle_keystroke(const sf::Event& event, cFramerateLimiter& fps_limiter);
 bool handle_scroll(const sf::Event& event);
 void do_load();
 void post_load();
-void do_save(short mode);
+void do_save(bool save_as = false);
 void do_abort();
 void increase_age();
 void handle_hunting();