Missing countries in JOSM list

[pnorman]

When using imagery.xml in JOSM country codes are not listed in the available entries list.

[pnorman]

Currently this information isn't recorded. The two obvious ways are to change the schema to add a country or to change the directory structure to add per-country directories to be able to infer a country.

Pros of changing the schema

• Keeps each JSON self-contained
• Doesn't require re-arranging
• Duplicates to some extent the information in the directory layout

Pros of changing the directory structure

• Doesn't require schema changes
• Avoids duplication
• Means JSON files are no longer self-contained

I'm thinking of preparing a pull request to add it as part of the schema, but thoughts welcome

[jfirebaugh]

I would prefer changing the schema. Imagery can cover multiple countries, so using the directory structure seems awkward.