LISBON (Reuters) – Portugal has been slow to implement new measures to combat corruption in government and law enforcement, a top European anti-graft monitoring body said on Wednesday, amid new concerns about the transparency of government-backed business deals. The report by the Group of States against Corruption (GRECO), part Europe’s main rights watchdog, the Council of Europe, is the result of its fifth round of evaluation of Portugal launched in 2017. Prime Minister Antonio Costa resigned in November over an investigation into alleged illegalities in his administration’s handling of sever…