Sinn Féin party leader Gerry Adams denied new accusations Thursday that he concealed child-abuse crimes within his own secretive movement, this time allegedly committed by a Belfast officer of the outlawed Irish Republican Army. Mairia Cahill, a member of one of Belfast’s top IRA families, appeared alongside a former foreign minister outside Ireland’s parliament to accuse Adams of conspiring to suppress her reports of being raped by an IRA commander from Adams’ home district in 1997, when she was 16. …