Add more explicit helpless reasons

Instead of just "while helpless", the death reason will tell
more explicitly why the player was helpless.  For example:
"while frozen by a monster's gaze"

src/timeout.c

@@ -51,6 +51,7 @@ stoned_dialogue()
 	case 3:		/* limbs turned to stone */
 		stop_occupation();
 		nomul(-3);	/* can't move anymore */
+		multi_reason = "getting stoned";
 		nomovemsg = You_can_move_again; /* not unconscious */
 		break;
 	default:
@@ -377,6 +378,7 @@ nh_timeout()
 			if (u.umoved && !Levitation) {
 			    slip_or_trip();
 			    nomul(-2);
+			    multi_reason = "fumbling";
 			    nomovemsg = "";
 			    /* The more you are carrying the more likely you
 			     * are to make noise when you fumble.  Adjustments
@@ -409,6 +411,7 @@ boolean wakeup_msg;
 {
 	stop_occupation();
 	nomul(how_long);
+	multi_reason = "sleeping";
 	/* generally don't notice sounds while sleeping */
 	if (wakeup_msg && multi == how_long) {
 	    /* caller can follow with a direct call to Hear_again() if
@@ -1271,6 +1274,7 @@ do_storms()
 	if(!u.uinvulnerable) {
 	    stop_occupation();
 	    nomul(-3);
+	    multi_reason = "hiding from thunderstorm";
 	    nomovemsg = 0;
 	}
     } else