Should we add other registries as well?

[mortenwh]

For example, enhetsregisteret has basic data about Norwegian organisations. It can be useful as a supplement to the gcmd_provider list. But since we actually store this data locally, pythesint can become quite big in terms of required storage. Do we want this? Or could we, e.g., only download data if indicated by a boolean flag (for example vocabularies that the user will use repeatedly)?