Make WALLIFIED_MAZE into a level flag.

It should now be randomly disabled for a 3rd of Gehennom, to make things
a tad more interesting there. It's also disabled in Baalzebub's lair,
to make things a little more interesting.

Still don't know why the beetle is disappearing.

include/config.h

@@ -416,7 +416,6 @@ typedef unsigned char	uchar;
 /* display features */
 /* dungeon features */
 /* dungeon levels */
-#define WALLIFIED_MAZE	/* Fancy mazes - Jean-Christophe Collet */
 /* monsters & objects */
 /* I/O */
 #if !defined(MAC)

include/rm.h

@@ -554,6 +554,8 @@ struct levelflags {
 	Bitfield(wizard_bones,1);       /* set if level came from a bones file
 					   which was created in wizard mode (or
 					   normal mode descendant of such) */
+        Bitfield(corrmaze, 1);          /* Whether corridors are used for the maze
+                                           rather than ROOM */
 };
 
 typedef struct

include/sp_lev.h

@@ -30,6 +30,7 @@
 #define GRAVEYARD       0x00000100L
 #define ICEDPOOLS       0x00000200L  /* for ice locations: ICED_POOL vs ICED_MOAT */
 #define SOLIDIFY	0x00000400L  /* outer areas are nondiggable & nonpasswall */
+#define CORRMAZE        0x00000800L  /* for maze levels only */
 
 /* different level layout initializers */
 #define LVLINIT_NONE		0