Resolved bug #89: Identical defines in codebase.

- GET_OBJ_PERM has been removed in favor of GET_OBJ_AFFECT.

Implemented idea #55: Mail stamp cost.
- Postmaster no longer mentions stamp price for immortals.

src/mail.c

@@ -301,14 +301,14 @@ static void postmaster_send_mail(struct char_data *ch, struct char_data *mailman
     return;
   }
   act("$n starts to write some mail.", TRUE, ch, 0, 0, TO_ROOM);
-  snprintf(buf, sizeof(buf), "$n tells you, 'I'll take %d coins for the stamp.'\r\n"
-       "$n tells you, 'Write your message. (/s saves /h for help).'",
-	  STAMP_PRICE);
 
-  act(buf, FALSE, mailman, 0, ch, TO_VICT);
-
-  if (GET_LEVEL(ch) < LVL_IMMORT)
+  if (GET_LEVEL(ch) < LVL_IMMORT) {
+    snprintf(buf, sizeof(buf), "$n tells you, 'I'll take %d coins for the stamp.'", STAMP_PRICE);
+    act(buf, FALSE, mailman, 0, ch, TO_VICT);
     decrease_gold(ch, STAMP_PRICE);
+  }
+
+  act("$n tells you, 'Write your message. (/s saves /h for help).'", FALSE, mailman, 0, ch, TO_VICT);
 
   SET_BIT_AR(PLR_FLAGS(ch), PLR_MAILING);	/* string_write() sets writing. */