By Sarah Mills LONDON (Reuters) – A handwritten Mozart manuscript, a flight book from the bombing of Hiroshima and a fragment from a Gutenberg Bible, as well as a cassock worn by Pope Francis, are among a range of items up for grabs in an online sale by U.S.-based Heritage Auctions. Fifty-two lots are being offered in the Historical Platinum Session Signature Auction, described as spanning “500 years of human innovation” and covering fields such as literature, science and history. “We start with a Gutenberg Bible leaf, so 1452 about, all the way up to material that went to the moon on Apollo 1…