corpse_xname overhaul (trunk only)

Extend the capabilities of corpse_xname() so that various callers can
be simplified.  It can how handle an article prefix, effectively turning it
into corpse_doname() (not quite; still need doname() to see a count when
quantity is more than one, or to see bless/curse state).  It can also handle
inclusion of adjectives like "partly eaten" or "bite-covered".  For unique
monsters those come out in the form
  the Chromatic Dragon's partly eaten corpse
instead of the old
  partly eaten Chromatic Dragon corpse
[so wishing probably needs to be taught about potentially finding a monster
name before assorted adjectives such as blessed; also, name_to_mon() needs
to learn how to cope with the possessive suffix].

     A sizeable chunk of this patch deals with consolidating some of the
redundant "petrified by a cockatrice corpse" handling.  It may be possible
to consolidate all remaining instances together since they're quite similar,
but I didn't think about that until just now and I want to get this patch
over with.

include/hack.h

@@ -1,4 +1,4 @@
-/*	SCCS Id: @(#)hack.h	3.5	2005/03/28	*/
+/*	SCCS Id: @(#)hack.h	3.5	2005/12/10	*/
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -76,6 +76,15 @@
 #define COST_BITE   13	/* start eating food */
 #define COST_OPEN   14	/* open tin */
 
+/* bitmask flags for corpse_xname();
+   PFX_THE takes precedence over ARTICLE, NO_PFX takes precedence over both */
+#define CXN_NORMAL	 0	/* no special handling */
+#define CXN_SINGULAR	 1	/* override quantity if greather than 1 */
+#define CXN_NO_PFX	 2	/* suppress "the" from "the Unique Monst */
+#define CXN_PFX_THE	 4	/* prefix with "the " (unless pname) */
+#define CXN_ARTICLE	 8	/* include a/an/the prefix */
+#define CXN_NOCORPSE	16	/* suppress " corpse" suffix */
+
 /*
  * This is the way the game ends.  If these are rearranged, the arrays
  * in end.c and topten.c will need to be changed.  Some parts of the