The dead never really die in Boston Lyric Opera’s exceedingly dark and psychologically driven new staging of Verdi’s “Macbeth.’’ They haunt, shadow, and torment the living - quite literally - walking alongside them, floating above them, and looming in their presence as giant totems out of some nightmare drawn from the primordial recesses of the brain. Before the curtain goes up, you can see where things are heading. Bodies of the dead, tightly bound, hang by their feet from the rafters.