LONDON/SYDNEY (Reuters) - Oil took another eyewatering 8% tumble on Monday and world shares buckled again as fears mounted that the global coronavirus shutdown could last for months.There were some bright spots, with Australian equities posting a standout jump as the government launched a super-sized support programme, but that was about it. Japan's Nikkei had led the rest of Asia lower and Europe's main markets slumped by 1.5-2.5% in early trade, adding to what has already been the region's..