Logs offer/bid cleared values.

def _logClearances(self):
        """ Logs offer/bid cleared values.
        """
        for offer in self.offers:
            logger.info("%.2fMW offer cleared at %.2f$/MWh for %s (%.2f)." %
                        (offer.clearedQuantity, offer.clearedPrice,
                         offer.generator.name, offer.revenue))
        for bid in self.bids:
            logger.info("%.2fMW bid cleared at %.2f$/MWh for %s (%.2f)." %
                        (bid.clearedQuantity, bid.clearedPrice,
                         bid.vLoad.name, bid.revenue))