Gozag ability tweaks and interface improvements.

This commit has the following effects, which are sufficiently interconnected
that separating this into multiple commits seemed hard:
* Don't allow players to invoke potion petition unless they have enough gold
  for the guaranteed porridge/blood potion.
* Don't allow players to invoke call merchant unless they have enough gold
  to pay for any shop that might be offered.
* Tweak the formula for shop prices; now it really doesn't depend on the
  shop type at all, and the maximum price will always be a nice round number.
* Display gold requirements in the ability screen. These numbers are slightly
  misleading because the actual gold cost for potion petition or call merchant
  will be a bit different from the displayed cost, but these numbers give the
  player a way to tell whether an ability can be used without committing to
  using it.

1 files changed, 3 insertions, 2 deletions

diff --git a/crawl-ref/source/defines.h b/crawl-ref/source/defines.h
index 402eeb37b9..0fc8c0fffa 100644
--- a/crawl-ref/source/defines.h
+++ b/crawl-ref/source/defines.h
@@ -348,8 +348,9 @@ const char * const GOZAG_PERMABRIBE_KEY      = "gozag_permabribed";
 const char * const GOZAG_BRIBE_BROKEN_KEY    = "gozag_bribe_broken";
 
 #define GOZAG_POTION_BASE_MULTIPLIER 25
-#define GOZAG_SHOP_BASE_MULTIPLIER 50
-#define GOZAG_SHOP_MOD_MULTIPLIER 4
+#define GOZAG_SHOP_BASE_MULTIPLIER 100
+#define GOZAG_SHOP_MOD_MULTIPLIER 20
+#define GOZAG_BRIBE_AMOUNT 3000
 #define GOZAG_MAX_BRIBABILITY 8
 #define GOZAG_MAX_POTIONS 4
 #define GOZAG_MAX_SHOPS 3