By Crispian Balmer ROME (Reuters) – A marble map of ancient Rome, that hasn’t been put on public view for almost 100 years, is getting its very own museum within sight of the Colosseum. The Museum of the Forma Urbis, enclosed within a new archaeological park on one of Rome’s famous seven hills opens on Friday — the latest offering from a city that is eager to broaden its attraction for growing hordes of tourists. “This is a beautiful day. We are opening an archaeological park in an extraordinary part of the city and a new museum showcasing a masterpiece which has not been visible for about a …