overview disclosure (trunk only)

Add 'o' to "i a v g c" disclosure set, to display final dungeon
overview at end of game.  It lists all levels visited rather than just
those that #overview considers to be interesting, but it doesn't reveal
any undiscovered aspects of those levels except for the presence of bones.
(I think revealing shops and altars and such would be worthwhile, but the
data for that isn't handy at the time.)  If the game ends due to death,
the bones section of the current level will have "you, <reason you died>"
(before any real bones entries for that level).  That occurs before bones
file creation so it doesn't give away whether bones are being saved.

     end.c includes some unrelated lint cleanup.

     Guidebook.{mn,tex} updates the section for autopickup_exceptions as
well as for disclose.  It had some odd looking indentation due to various
explicit paragraph breaks.  I took "experimental" out of its description
since it was moved out of the experimental section of config.h long ago.
The revised Guidebook.tex is untested.

include/patchlevel.h

@@ -13,7 +13,7 @@
  * Incrementing EDITLEVEL can be used to force invalidation of old bones
  * and save files.
  */
-#define EDITLEVEL	53
+#define EDITLEVEL	54
 
 #define COPYRIGHT_BANNER_A \
 "NetHack, Copyright 1985-2012"