Support for the NIST Public Data Repository in DOI downloader

[jat255]

Description of the desired feature: The NIST Public Data Repository is a rich source of datasets published by the National Institute of Standards and Technology, each of which have DOIs and is API-accessible. It should be of minimal effort to add a DOI downloader for files from this resource.

Are you willing to help implement and maintain this feature? Yes, I'm currently working on a demo implementation.