Cabaret ***
                   By: David ShewardAlan CummingDuring "Wilkommen," the opening number of Roundabout Theatre Company's revival of its 1998 revival of Cabaret at Studio 54, Alan Cumming as the lascivious Emcee points to one of the sluttish chorus girls and tells the audience they danced together in the show in "the last century." This refere…