NEW YORK, Jan 14 (Reuters) - US Treasuries prices extended gains on Thursday, sending long bonds up a point, after an auction of 30-year debt attracted solid demand. The government sold $13 billion worth of 30-year bonds in a reopening of previously ...http://www.reuters.com/article/idUSN1420055620100114NEW YORK (Dow Jones)--The Treasury market extended a rally Thursday afternoon following strong demand on a $13 billion 30-year bond auction, which successfully wrapped up the government's $84 bil...