Prevent negative z balances,Hide 0-balance addresses from the balances table,Rename new address to next address

src/camount.h

@@ -71,6 +71,9 @@ public:
     bool operator> (const CAmount& other) const {
         return this->amount > other.amount;
     }
+    bool operator== (const qint64 other) const {
+        return this->amount == other;
+    }
 };
 
 #endif // CAMOUNT_H