Add script to query citation list of each publication in Crossref

[phcerdan]

IJ publications cite other IJ publications.
Now that we have DOI's, we should rerun the query of the citation list in Crossref, to see if we can get a new score (a DOI match) for IJ articles. Right now, we have an unstructured citation with the parsed content from the publication pdf.

We do not need to parse the pdf again, it would be good to have an independent script to update the citation list from unstructured to doi match.