There were a number of other URLs for CKAN instances in the CKAN URL
above, but some sites are now gone completely, or if they do exist,
I can't figure out how to get access to the CKAN API on their instance.
# NOT RUN {servers()
ckan_info(servers()[5])
# what version is each CKAN server runningout <- lapply(servers()[1:6], ckan_info)
vapply(out, "[[", "", "ckan_version")
# }