LONDON (Reuters) - Stock and currency fear gauges that soared to the levels of the 2008 global financial crisis have become less frantic since central banks and governments stepped up efforts to combat spreading economic damage from the coronavirus epidemic.But while that decline in market volatility will offer some respite to battered investors, it is too soon to declare that markets have bottomed out after a 30% cliff-edge drop from record highs.The Cboe Volatility Index, known as Wall..