GLOBAL MARKETS-Asian shares mostly firmer, gold hits 1-mth high

* Shares inch ahead, trading thin as Japan on holiday * Dollar skids on the yen, China sets yuan at new peak SYDNEY, Jan 13 (Reuters) - Asian shares and currencies were mostly firmer on Monday in the wake of surprisingly weak U.S. jobs numbers that revived speculation the Federal Reserve could keep policy loose for longer. Activity in Asia on Monday was curbed by a holiday in Japan.