(REUTERS)   Sceptical euro zone finance ministers demanded on Saturday (July 11) that Greece go beyond painful austerity measures accepted by Prime Minister Alexis Tsipras if he wants them to open negotiations on a third bailout for his bankrupt country to keep it in the euro. The ministers meeting in Brussels postponed until Sunday a decision on whether to recommend starting talks on a new loan for Athens and sought further commitments first on product market […]