The Australian share market has dipped modestly for a second day as oil prices slid, even as a surging trade surplus bolstered the mining sector. The S&P/ASX200 benchmark index finished Thursday down 20.4 points, or 0.38 per cent, to 5,364.2, while the All Ordinaries index was down 14.9 points, or 0.27 per cent, at 5,449.9. […]