add logfile support

main.go

 import (
 	"log"
 	"net/http"
+	"os"
 	"text/template"
+	"time"
 )
 
 func main() {
 	readConfigForTest()
 	db.h = nil //make sure it's in proper state.
 
+	filename := "rpn.superforex." + time.Now().Format("20060102150406") + ".log"
+	f, err := os.OpenFile(filename, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
+	if err != nil {
+		log.Fatalf("error opening file: %v", err)
+	}
+	defer f.Close()
+	log.SetOutput(f)
+	log.Println("Server started on: http://localhost:8080")
+
+	//setup http handler
 	http.HandleFunc("/choosePayment", choosePayment)
 	http.HandleFunc("/rpnNameAndCard", rpnNameAndCard)
 	http.HandleFunc("/rpn_notify", rpnNotify) //called by rpn
-	// http.HandleFunc("/", Index)
-	// http.HandleFunc("/show", Show)
-	// http.HandleFunc("/new", New)
-	// http.HandleFunc("/edit", Edit)
-	// http.HandleFunc("/insert", Insert)
-	// http.HandleFunc("/update", Update)
-	// http.HandleFunc("/delete", Delete)
 	fs := wrapHandler(http.FileServer(http.Dir("./PG")))
 	http.HandleFunc("/", fs)
 	http.ListenAndServe(":8080", nil)
-	log.Println("Server started on: http://localhost:8080")
+
+	//start log file
+
 }
 
 func errPage(w http.ResponseWriter, code int, msg string) {