Source: thestar.com/business There is a cancer on Canadian journalism. The malignancy is Postmedia Network Canada Corp., a foreign-controlled, debt-burdened contrivance flirting with insolvency that nonetheless is relied upon by about 21 million Canadian readers. Postmedia’s 200-plus media outlets, mostly newspapers, including some of the biggest dailies in the country, represent a far greater concentration of news media ownership than exists …