Wall Street opened higher on Thursday as the quarterly earnings season kicked into high gear. . The Dow Jones Industrial Average rose 32.06 points, or 0.16 per cent, to 20,436.55. The S&P 500 gained 5.52 points, or 0.23 per cent, to 2,343.69. The Nasdaq Composite added 23.33 points, or 0.4 per cent, to 5,886.37. . . .