By Ankur Banerjee SINGAPORE (Reuters) – The yen hovered around a four-month high against the dollar on Wednesday as traders contemplated the shock move by the Bank of Japan to adjust its bond yield control programme and potentially open the door to move away from its ultra-easy monetary policy. In a surprise move, the BOJ on Tuesday decided to let long-term yields move 50 basis points either side of its 0% target, wider than the 25 basis point band previously, even as the central bank kept broad policy setting unchanged. Japanese yen weakened 0.26% versus the greenback at 132.06 per dollar ear…