(Reuters) - A dramatic global stock rally faded on Thursday after a fall in Chinese industrial profits offered a reminder of the pressures on the world economy.Still, an index of world stocks stayed off near two-year lows hit earlier this week before Wednesday's 1,000 point-plus surge on the U.S. Dow Jones index, which was attributed to the strongest holiday sales in years."Yesterday was a blowout day for U.S. equity markets which triggered optimism that this could be a key reversal day but the..