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.]

include/flag.h

@@ -38,7 +38,7 @@ struct flag {
 	boolean  null;		/* OK to send nulls to the terminal */
 	boolean  perm_invent;	/* keep full inventories up until dismissed */
 	boolean  pickup;	/* whether you pickup or move and look */
-
+	boolean  pickup_thrown;	/* auto-pickup items you threw */
 	boolean  pushweapon;	/* When wielding, push old weapon into second slot */
 	boolean  rest_on_space; /* space means rest */
 	boolean  safe_dog;	/* give complete protection to the dog */

include/obj.h

@@ -99,7 +99,7 @@ struct obj {
 #endif
 	Bitfield(greased,1);	/* covered with grease */
 	Bitfield(nomerge,1);	/* set temporarily to prevent merging */
-	/* 1 free bit */
+	Bitfield(was_thrown,1);	/* thrown by hero since last picked up */
 
 	Bitfield(in_use,1);	/* for magic items before useup items */
 	Bitfield(bypass,1);	/* mark this as an object to be skipped by bhito() */