By Hanna Rantala LONDON (Reuters) – A rare painting by German expressionist Franz Marc – returned last year from a museum to the descendents of a Jewish collector who fled the Nazis – is expected to set a new world record for the artist when it is offered for sale in an auction next month. “The Foxes” (Die Füchse), featuring two brightly coloured, intertwined foxes, is estimated to fetch around 35 million pounds ($47 million) when it goes on sale at Christie’s in London on March 1. “It’ll be an amazing moment for the art world because Franz Marc’s important...