Merged requested to merge mnt/download-latest-metatdata into master
Updating FUNPACK to download the latest versions of the UKB data field/encoding schema files when it is executed, rather than relying on the pre-downloaded files stored in
funpack/data/, which were manually updated on each release.
Some associated re-organisation and refactoring -
funpack/data/ is renamed to
funpack.schema, and the
funpack.hierarchy modules moved into there.