store deserialized tx in/out in wallet file for fast computation

lib/commands.py

@@ -342,7 +342,7 @@ class Commands:
     def history(self):
         balance = 0
         out = []
-        for item in self.wallet.get_tx_history():
+        for item in self.wallet.get_history():
             tx_hash, conf, is_mine, value, fee, balance, timestamp = item
             try:
                 time_str = datetime.datetime.fromtimestamp( timestamp).isoformat(' ')[:-3]