NEW YORK — At a time when criminal justice reform has gained national attention and bipartisan support from even the leading candidates for president, a handful of documentaries at the Tribeca Film Festival are giving a close-up to the human cost of mass incarceration.The films pursue the issue in numerous directions, from the conditions of solitary confinement to the difficult re-entry to society ex-convicts face. But they’re united in depicting a system that’s dehumanizing and destructive for all who …