support for a person's 'heimat' or 'heimatort'
Replace ZIP Wikipedia article link with the actual specification link.

The Wikipedia article is interesting, well written, and useful, but it
isn't a specification.
Make a separate Standard Values type
s/standard value/enumerated value
Merge branch 'heimat'
Merge branch 'standard-values'
Brings this branch up to date with the "master" branch.