MT Newswires -Shutterstock New Zealand shares finished flat with a negative bias on Thursday amid a broad-based sell-off in all Asian markets after a lower Wednesday Wall Street close.The S&P/NZX 50 index was little changed to close at 13,444.02.On Wednesday, the S&P 500 lost 0.5%, the Nasdaq fell 1.5%, while the Dow Jones managed to gain 0.5%.Wall Street was impacted by investors'...