R1049 - various wand of digging bugs

- Breaking wand of digging dug through rock which should be undiggable.
Checks assumed pits would never show up in solid rock.
- Breaking wand of digging near shop walls wouldn't anger the shopkeeper
Checks assumed pits would never show up in walls, also, added a special
case to pay_for_damage to handle the case where you're falling thru and
can't be asked to pay.
- Shop walls wouldn't be restored if there are pits in the way.
Checks assumed pits would never show up in walls.
- If there was a hole outside the shop, you could kick stuff out of the
door into the hole without shopkeeper noticing.  Added the missing check.

src/hack.c

@@ -422,7 +422,7 @@ still_chewing(x,y)
     unblock_point(x, y);	/* vision */
     newsym(x, y);
     if (digtxt) You(digtxt);	/* after newsym */
-    if (dmgtxt) pay_for_damage(dmgtxt);
+    if (dmgtxt) pay_for_damage(dmgtxt, FALSE);
     (void) memset((genericptr_t)&digging, 0, sizeof digging);
     return 0;
 }