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Does various checks to see if patterns files alrady downloaded, out of date, if some/all are deleted and in need of an update
ftd_fetch_patterns()
character vector of file paths
Other ftdoi: ftd_doi(), ftd_members(), ftd_prefixes(), ftdoi_cache, prefix_local()
ftd_doi()
ftd_members()
ftd_prefixes()
ftdoi_cache
prefix_local()