A judge has set a September 15th trial date for a union lawsuit against the state's 2011 pension overhaul law.  The trial date was set yesterday just hours after a news conference scheduled by federal mediators to announce a proposed settlement of the lawsuit was canceled.  State Treasurer Gina Raimondo told reporters work on a settlement will continue.  The state Retirement Board has posted that a meeting will be held tomorrow to discuss the potential approval of a settlement.