BRUSSELS (Reuters) - A group of European Union countries is calling for the bloc to cast a wider net when listing tax havens and to consider imposing stricter sanctions for countries facilitating tax avoidance, according to an EU document and an EU official.The document, prepared by the Danish government and seen by Reuters, urges a discussion on whether "current criteria provide sufficient protection against tax avoidance and evasion" and pushes for "strengthened" standards and sanctions...