Return the trend message.

        Do not take into account if trend < significant

def trend_msg(self, trend, significant=1):
        """Return the trend message.

        Do not take into account if trend < significant
        """
        ret = '-'
        if trend is None:
            ret = ' '
        elif trend > significant:
            ret = '/'
        elif trend < -significant:
            ret = '\\'
        return ret