* Add a migration to drop the old countries field.
* Update all templates/views/utility methods to point at the new country
field and dereference it as necessary.
* Add the flags images to a few views where it makes sense.
* Cleanup the download page layout quite a bit.
* Bump the mirror status JSON version to 3; add country_code attribute.
Signed-off-by: Dan McGee <dan@archlinux.org>
This allows a named top-level mirror to have geographically distributed
URLs, e.g. kernel.org and the geo-DNS setup.
Signed-off-by: Dan McGee <dan@archlinux.org>