UPDATE 1-Golf-Singh in BMW drivers seat, Woods and McIlroy one back (Reuters)

* Woods grinds way to bogey-free 67 in second round * Singh chasing first PGA Tour win since 2008 (Recasts at end of round with quotes) CARMEL, Indiana, Sept 7 (Reuters) - Former world number oneVijay Singh rolled back the clock with a six-under 66 on Fridayto grab the second round lead at the BMW Championship, whileTiger Woods and Rory McIlroy were a further shot back. ...