Use YML-defined suggested citation in API upload script

[phargogh]

The UK Natural History Museum has a suggested citation on their pages (example), which would be a nice feature to add.

[phargogh]

I wonder if https://github.com/datopian/ckanext-doi is related?

[phargogh]

So it turns out that ckanext-doi is related, but there's an administratively separate issue of using Stanford's DataCite subscription to pay for it, which will cost on the order of $1000/year for access.

While looking into this , I also started looking into ckanext-attribution, but couldn't immediately get the extension to compile due to issues with spacy. It isn't clear if ckanext-attribution is strictly needed, and there are likely other ways to represent the information we need. #36 for that plugin.

At this time, the clearest, simplest path forwards appears to be through adding a custom field in our custom NatCap plugin (CKAN API docs), so I think that's what I'll do next.

[phargogh]

It turns out this can be done really easily with ckanext-scheming.

[phargogh]

Suggested citation field is live!

Next task: figure out how to edit the suggested citation via the API

[phargogh]

We have now figured out how to add a suggested citation via the api, so we this issue is now on hold until we figure out the MCF side of things. Waiting on natcap/geometamaker#17

[phargogh]

OK well, it turns out that I haven't yet figured out how to actually set the attribute yet when the attribute is defined in ckanext-scheming. And the docs aren't particularly helpful on this front either. Still investigating.