The global market for tablet computers went into hibernation in early 2014, ending a long run of sizzling growth, a survey showed. The IDC report said sales of tablets including newly introduced convertible PCs totaled 50.4 million units in the first quarter of 2014. That was just 3.9% higher than the same period a year earlier, and down 35.7% from the busy holiday season that included the fourth quarter of 2013.