fix tx_fees wallet and other bug fixes to be compatible with electrum 0.6.2-master(0.6.3)

will.py

@@ -628,7 +628,7 @@ class WillItem(Logger):
             self.description = w.get('description',None) 
             self.time = w.get('time',None) 
             self.change = w.get('change',None) 
-            self.tx_fees = w.get('tx_fees',0)
+            self.tx_fees = w.get('baltx_fees',0)
             self.father = w.get('Father',None)
             self.children = w.get('Children',None)
             self.STATUS = copy.deepcopy(WillItem.STATUS_DEFAULT)
@@ -658,7 +658,7 @@ class WillItem(Logger):
             'description':self.description,
             'time':self.time,
             'change':self.change,
-            'tx_fees':self.tx_fees
+            'baltx_fees':self.tx_fees
         }
         for key in self.STATUS:
             try: