If the witches in Shakespeare's Macbeth need a lot of space to cook up their double helping of toil and trouble, they've got it at the Park Avenue Armory. That’s where the latest New York staging of Macbeth is being presented. The lavish and action-packed production is a joint effort between the Armory and the Manchester International Festival. It is also the New York stage debut of acclaimed actor and director Kenneth Branagh, who takes the title role (he is co-director here, with Rob Ashford).