CANADA STOCKS-Earnings, Europe auctions lift TSX

* TSX up 37.33 points, 0.3 pct, at 12,026.28 * Seven of 10 sectors on firmer ground By Claire Sibonney TORONTO, April 24 (Reuters) - Toronto's main stock index edged higher in early trade Tuesday, taking its cue from solid domestic earnings and steady global markets after European government debt auctions saw good demand. Canadian National Railway, the most influential gainer, rose 1.4 percent to C$80.50, after reporting late on Monday that its full-year earnings would come in