Campaigners say the chaos caused by the global IT outage last week underlines the risk of moving towards a cashless society.Supermarkets, banks, pubs, cafes, train stations and airports were all hit by the failure of Microsoft systems on Friday, leaving many unable to accept electronic payments. The impact was especially severe for businesses that no longer accept cash.The Payment Choice Alliance (PCA), which campaigns against the move towards a cashless society, lists 23 firms and groups, at le...