save waypoints to a file in a human readable CSV file

def save_waypoints_csv(self, filename):
        '''save waypoints to a file in a human readable CSV file'''
        try:
            #need to remove the leading and trailing quotes in filename
            self.wploader.savecsv(filename.strip('"'))
        except Exception as msg:
            print("Failed to save %s - %s" % (filename, msg))
            return
        print("Saved %u waypoints to CSV %s" % (self.wploader.count(), filename))