Sunsword redux (trunk only)

This started out as a one line change.  After I saw someone in the
newsgroup mention that Sunsword's light was inferior to that of a lamp,
I decided to make it work better (than in 3.4.3, that is, becoming the
same brightness as a lamp) when blessed and worse when cursed (useless to
hero but still visible if wielded by a monster).  But then it needed to
change light radius when its curse/bless state changed, and it needed
message feedback when doing so, and that got kind of complicated.  I
wouldn't have bothered if I'd known what I was getting into, but I don't
want to throw it away now that I've done all this work....

     Sunsword now gives a light radius of 3 when blessed (same as a lit
lamp), radius of 2 when uncursed (same as a lit candle and as it has been
providing since added in 3.4.0), and a radius of 1 when cursed (nearly
but not completely useless, as mentioned above).  Also, it now "shines"
rather than "glows" since we usually use the latter for temporary effects.

src/timeout.c

@@ -1,4 +1,4 @@
-/*	SCCS Id: @(#)timeout.c	3.5	2007/03/15	*/
+/*	SCCS Id: @(#)timeout.c	3.5	2009/01/20	*/
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -1145,7 +1145,7 @@ begin_burn(obj, already_lit)
                 if (artifact_light(obj)) {
 		    obj->lamplit = 1;
 		    do_timer = FALSE;
-		    radius = 2;
+		    radius = arti_light_radius(obj);
 		} else {
 		    impossible("begin burn: unexpected %s", xname(obj));
 		    turns = obj->age;