The smell of popcorn drifted through Oakland’s Grand Lake Theater, but the tubs in the audience members’ hands sat untouched as people sat in tense silence, watching graphic scenes in an Alabama prison unfold before them.  About 100 people attended the one-night screening last Wednesday of HBO’s “The Alabama Solution,” which included a panel discussion about corruption and abuse in the penitentiary system. The screening was organized by the nonprofit For the People, as part of a broader effort to…