// a fuction to login a user
        // finds the user and makes the loggedinUser
        // does nothing if the user doesn't exist
        public Boolean Login(String nickname, String group)
        {
            int userID = _sqlHandler.loginUser(nickname, group, hashedLPassword);

            if (userID != -1)
            {
                this._loggedinUser = userID;
                mLogger.AddLogMessage("User " + nickname + " logged in successfully");
                return(true);
            }
            return(false);
        }