Added current_msg variable for msg header @-codes.

src/sbbs3/getmsg.cpp

@@ -125,6 +125,7 @@ void sbbs_t::show_msghdr(smbmsg_t* msg)
 	char	*sender=NULL;
 	int 	i;
 
+	current_msg=msg;
 	attr(LIGHTGRAY);
 	if(useron.misc&CLRSCRN)
 		outchar(FF);

src/sbbs3/sbbs.h

@@ -314,6 +314,8 @@ public:
 
 	csi_t	main_csi;		/* Main Command Shell Image */
 
+	smbmsg_t*	current_msg;	/* For message header @-codes */
+
 			/* Global command shell variables */
 	uint	global_str_vars;
 	char **	global_str_var;