fix #M108 - seeing while asleep

I think being asleep or unconscious ought to override vision the way
that being blinded does, but that's a more ambitious change than I care to
tackle.  This replaces You("see ...") with You_see("..."), comparable to
You_hear().  It catches the reported door case and several variations of
light sources burning out while on the floor rather than in inventory, but
it probably misses some other cases.  zap_over_floor() in particular is
highly suspect.

src/zap.c

@@ -1,4 +1,4 @@
-/*	SCCS Id: @(#)zap.c	3.5	2005/05/18	*/
+/*	SCCS Id: @(#)zap.c	3.5	2005/06/22	*/
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -2381,7 +2381,7 @@ struct obj *obj;	/* wand or spell */
 				pline("A trap door beneath you closes up then vanishes.");
 				disclose = TRUE;
 			} else {
-				You("see a swirl of %s beneath you.",
+				You_see("a swirl of %s beneath you.",
 					is_ice(x,y) ? "frost" : "dust");
 			}
 		} else {