Canalys is a pretty well respected global stat-keeper and now it seems to be relying on that reputation to push through a pretty controversial message: tablets, such as Apple's iPad and Samsung's Galaxy Tab, are PCs. "Accept new market realities," urges its polemic press release, before laying out global quarterly shipments that peg Apple as the world's third most prolific PC vendor (without tablets, Apple doens't even break the top 5 according to IDC and Gartner). The company that was laboring with a mere 3.8 percent market share in 2009 has shot up to 10.8 with t