[7644] Fixed pet slot values using in pet save. Author: VladimirMangos

Problem exist from client version switch when stable slot amount changed.
    In result this has been source problems with stable use (3-4 slots) and possible pet lost in some cases
    or "not save state" for summoned pets.
    Use enums to avoid repeating problem, use more safe value for not-in-slot save (for summoned pets)
    Fixed data preparing for MSG_LIST_STABLED_PETS.

--HG--
branch : trunk

src/game/Pet.h

@@ -35,13 +35,16 @@ enum PetType
 
 extern char const* petTypeSuffix[MAX_PET_TYPE];
 
+#define MAX_PET_STABLES         4
+
+// stored in character_pet.slot
 enum PetSaveMode
 {
-    PET_SAVE_AS_DELETED       =-1,
-    PET_SAVE_AS_CURRENT       = 0,
-    PET_SAVE_IN_STABLE_SLOT_1 = 1,
-    PET_SAVE_IN_STABLE_SLOT_2 = 2,
-    PET_SAVE_NOT_IN_SLOT      = 3
+    PET_SAVE_AS_DELETED        = -1,                        // not saved in fact
+    PET_SAVE_AS_CURRENT        =  0,                        // in current slot (with player)
+    PET_SAVE_FIRST_STABLE_SLOT =  1,
+    PET_SAVE_LAST_STABLE_SLOT  =  MAX_PET_STABLES,          // last in DB stable slot index (including), all higher have same meaning as PET_SAVE_NOT_IN_SLOT
+    PET_SAVE_NOT_IN_SLOT       =  100                       // for avoid conflict with stable size grow will use 100
 };
 
 enum HappinessState