Don’t look now, but the good times are rolling for the Brooklyn Nets again, as it did when the team won 11 of its first 15 contests to begin the season. Rape investigations aside, of course. So who’s to thank for the turnaround? Improving to 20-15 from 14-14 since the dismissal of Avery Johnson, the team has played with much better chemistry in recent games, and more importantly, the play of point guard Deron Williams has gone up several notches. Certainly, interim