BRUSSELS (Reuters) - European countries demanded more DNA testing of meat products and tougher labeling rules over a scandal involving horsemeat sold as beef that has shocked the public and raised concerns over the safety of the continent's food supply chains. Officials have said there is no risk to public health from the tainted foods. But the suspected fraud has caused particular outrage in Britain, where many view the idea of eating horsemeat with distaste, and exposed flawed food controls. ...