修改套利回测的计算bug，增加每日净值的结果导出。（暂不支持结算价的净值记过计算）

vn.trader/ctaAlgo/ctaBacktesting.py

@@ -155,7 +155,6 @@ class BacktestingEngine(object):
 
         return self.capital, self.avaliable, self.percent, self.percentLimit
 
-        
     #----------------------------------------------------------------------
     def setStartDate(self, startDate='20100416', initDays=10):
         """设置回测的启动日期"""
@@ -1388,6 +1387,8 @@ class BacktestingEngine(object):
         """
         self.strategy = strategyClass(self, setting)
         self.strategy.name = self.strategy.className
+        self.strategy.onInit()
+        self.strategy.onStart()
         
     #----------------------------------------------------------------------
     def sendOrder(self, vtSymbol, orderType, price, volume, strategy):
@@ -1458,8 +1459,6 @@ class BacktestingEngine(object):
                 order.cancelTime = str(self.dt)
                 del self.workingLimitOrderDict[vtOrderID]
 
-
-
     #----------------------------------------------------------------------
     def sendStopOrder(self, vtSymbol, orderType, price, volume, strategy):
         """发停止单（本地实现）"""