General revisions following rOpenSci review. Note several breaking changes:
an_read now takes a cache parameter instead of cache_directory (and now can have special values "session" and "persistent")an_filter and an_suggest now take an origin parameter that replaces the previous origin_country and cga_source parametersan_read(..., simplified = TRUE) no longer contains the "country_name" or "cga_source_gazetteer columns, but if needed these are available via an_read(..., simplified = FALSE)NEWS.md file to track changes to the package.