bug#36252: 26.1; bibtex-generate-autokey does not use use date field

[Roland Winkler]

On Mon Dec 7 2020 Roland Winkler wrote:
> A few days ago I installed in master a related patch that I had
> lying around for some time.  I believe it addresses the question
> of searching the date and year field in a cleaner way by passing a
> list of field names to bibtex-text-in-field.  But I didn't know
> the new iso8601 library.  So that's the main purpose of the new
> patch attached below.

Installed as commit 4a700a2f79d5cca64602b7cad30d6485cfe0e449.

Closing.