saving message history (trunk only)

On September 11, 2003 "<Someone>" wrote:
> When we're going to have a different save file format, could
> the last messages in the message history be saved as well, so
> ^P would work the same before and after saving (possibly
> including a few less messages to make room for the startup
> messages?).

This seemed like a reasonable request. This patch:
- adds the core support required.
- adds the tty supporting routines.

include/extern.h

@@ -2288,6 +2288,8 @@ E void FDECL(setmnotwielded, (struct monst *,struct obj *));
 E void FDECL(choose_windows, (const char *));
 E char FDECL(genl_message_menu, (CHAR_P,int,const char *));
 E void FDECL(genl_preference_update, (const char *));
+E char *FDECL(genl_getmsghistory, (BOOLEAN_P));
+E void FDECL(genl_putmsghistory, (const char *));
 
 /* ### wizard.c ### */