NEW YORK (Reuters) - The dollar fell sharply against the euro on Friday as the common currency jumped on hopes that a Brexit deal between Britain and the European Union could improve the odds of the euro zone avoiding a recession for now.In one of the most striking flourishes of the three-year Brexit drama, British Prime Minister Boris Johnson confounded his opponents on Thursday by clinching a new deal with the EU, even though the bloc had promised it would never reopen a treaty it agreed last..