By Stephanie Levitz and Craig Wong, The Canadian Press OTTAWA - Prime Minister Stephen Harper ended months of market uncertainty by approving the foreign takeovers of Calgary-based Nexen Inc. and Progress Energy Resources Corp. — but insisted future appropriations by state-owned firms in the oilsands would become the exception rather than rule. China's CNOOC and Malaysia's Petronas, both Asian state-controlled enterprises, received the OK late Friday as part of a wide-ranging update of [Read more]