GLOBAL MARKETS-Shares rally on U.S. tech earnings, ECB purchase plans

* Wall Street higher on Apple, Texas Instruments results * European shares surge on report ECB to buy corporate bonds * U.S. Treasury prices, euro fall (Adds oil settlement prices) By Sam Forgione NEW YORK, Oct 21 (Reuters) - A measure of global equity markets advanced on Tuesday as technology earnings lifted U.S. shares and the prospect of European Central Bank corporate bond purchases boosted European stocks, while weighing on safe-haven U.S. Treasuries prices. Shares of