Compare a list of NSS versions and return the latest one.
        Uses first_older_than_second() for comparison.
        :param versions: an array of NSS version strings
        :return: verbatim copy of the most recent version string

def most_recent_among(versions):
        """
        Compare a list of NSS versions and return the latest one.
        Uses first_older_than_second() for comparison.
        :param versions: an array of NSS version strings
        :return: verbatim copy of the most recent version string
        """
        latest = versions[0]
        for v in versions[1:]:
            if nssversion.first_older_than_second(latest, v):
                latest = v
        return latest