A heartfelt 3D tribute by Wim Wenders to Pina Bausch, the late modern ballet choreographer. By Peter BradshawWim Wenders's deeply intelligent 3D tribute to the work of the modern dance choreographer Pina Bausch was conceived as a collaboration with her. Bausch died during the production in 2009, and the resulting film achieves a poignant, elegaic quality, shot through with an overwhelming sense of loss, both on the p…