Finish refine the config things.

code/rest/footprint_service.go

@@ -76,7 +76,7 @@ func (this *FootprintService) Trace(writer http.ResponseWriter, request *http.Re
 	}
 
 	//有可能DB尚且没有配置 直接打印出内容，并且退出
-	if core.CONFIG.IsInstalled() {
+	if core.CONFIG.Installed() {
 		user := this.findUser(writer, request)
 		userUuid := ""
 		if user != nil {