Adds new column to 'merchantlist' table.

Adds 'probability' after 'classes_required', valid values are 0 to 100.

zone/npc.h

@@ -390,6 +390,8 @@ public:
 
     uint32 	GetSpawnKillCount();
     int 	GetScore();
+	void 	SetMerchantProbability(uint8 amt) { probability = amt; }
+	uint8	GetMerchantProbability() { return probability; }
     void 	mod_prespawn(Spawn2 *sp);
 	int 	mod_npc_damage(int damage, SkillUseTypes skillinuse, int hand, const Item_Struct* weapon, Mob* other);
 	void	mod_npc_killed_merit(Mob* c);
@@ -504,6 +506,7 @@ protected:
 	std::list<MercData> mercDataList;
 	
 	bool raid_target;
+	uint8	probability;
 
 private:
 	uint32	loottable_id;