Works collected by US-German art dealer Heinz Berggruen from the most important painters and sculptors of the 20th century went on display on Wednesday in France’s capital, where his artists lived and where Berggruen had his gallery. With nearly 90 key works by Pablo Picasso, Georges Braque, Paul Klee, Henri Matisse, Alberto Giacometti and Paul Cézanne, the touring collection from Berlin’s Berggruen Museum is now making a stop at the Musée de l’Orangerie in the French capital. Under the title “Heinz Berggruen – A Dealer and His Collection,” the exhibition focuses on his relationship with his a…