Regional stocks jump on central banks' response China, Taiwan, Hong Kong cut rates; Seoul, Singapore, Fed agree to swaps By V. Phani Kumar, MarketWatch Last update: 12:46 a.m. EDT Oct. 30, 2008 HONG KONG (MarketWatch) -- Asian markets surged Thursday as investors went on a buying spree after central banks responded strongly to slowing economic growth and turmoil in financial markets by reducing interest rates or boosting liquidity of U.S. dollars. South Korean stocks rocketed and Singaporean shares extended gains into a third straight session after their central banks opened a swap facility with the U.S. Federal Reserve that will...