add pickup_thrown option (trunk only)

This patch by <email deleted> was released
when 3.4.1 was current and has been incorporated into slash'em.  It is
extremely useful while using ranged weapons.  When both autopickup and
pickup_thrown are enabled, walking across previously thrown objects will
pick them up even if they don't match the current pickup_types list.
[See cvs log for patchlevel.h for longer description.]

doc/Guidebook.tex

@@ -27,7 +27,7 @@
 \begin{document}
 %
 % input file: guidebook.mn
-% $Revision: 1.97 $ $Date: 2006/04/23 17:22:45 $
+% $Revision: 1.98 $ $Date: 2006/04/30 17:55:09 $
 %
 %.ds h0 "
 %.ds h1 %.ds h2 \%
@@ -2550,6 +2550,11 @@ level (Unburdened, Burdened, streSsed, straiNed, overTaxed,
 or overLoaded), you will be asked if you want to continue.
 (Default `S').
 %.lp
+\item[\ib{pickup\_thrown}]
+If this option is on and ``{\it autopickup\/}'' is also on, try to pick up
+things that you threw, even if they aren't in ``{\it pickup\_types\/}'' or
+match an autopickup exception.  Default is on.
+%.lp
 \item[\ib{pickup\_types}]
 Specify the object types to be picked up when ``{\it autopickup\/}'' 
 is on.  Default is all types.  If your copy of the game has the