`FetchUselessDescriptors 1` used to imply `UseMicrodescriptors 0`, but due to legacy/trac#6769, it doesn't in 0.3.0 and later. Therefore, clients that want to download a full consensus have to explictly set `UseMicrodescriptors 0`. ~~We should document this in the man page and probably the changelog summary, as~~ it is a breaking change for many configs that used to obtain a full consensus. ~~(Alternately,~~ we could fix this bug by FetchUselessDescriptors download a full consensus, even on clients, and document that behaviour.) Discovered when running a test bandwidth authority - see legacy/trac#20621.