Do not email "new valid order" logs nor ask OrderWatcher to watch alr…

…eady stored, fillable orders

core/message_handler.go

@@ -138,6 +138,9 @@ func (app *App) HandleMessages(messages []*p2p.Message) error {
 
 	// Store any valid orders and update the peer scores.
 	for _, acceptedOrderInfo := range validationResults.Accepted {
+		if !acceptedOrderInfo.IsNew {
+			continue
+		}
 		msg := orderHashToMessage[acceptedOrderInfo.OrderHash]
 		// If we've reached this point, the message is valid and we were able to
 		// decode it into an order. Append it to the list of orders to validate and