* Markets rocked as Switzerland abandons three-year-old franc cap* Franc soars 30 percent, European shares yo-yo, yields tumble* Wall Street futures turn positive, dollar make ground after data* Copper reclaims some ground, oil bounces back after slide againBy Marc JonesLONDON, Jan 15 (Reuters) - Global markets were thrown into turmoil on Thursday as a shock move by Switzerland to abandon its more