Fix primary key of institution_country_aliases

The key is composed of both `alias` and `country_id`,
not just the `alias`. I also moved the attribute `country_id`
next to the `alias` in the definition.
Add missing institution alias for AR1 WGIII

The alias was skipped due to the primary key constraint
wrongly defined on the `alias` only, which results in
a duplicate in this case (two different aliases for
Japan and Malta, the country provides the context).