Let me answer your points one by one.
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This change is intended. Some users prefer abbreviated and some full journal names. We thus opted for the option which contains the most information (= full name). However, we plan to implement that cleanup operations can be invoked directly after import and in this way it would be possible to automatically convert to abbreviated journal names.
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I couldn’t find any reference to “Science (New York, N.Y.)” or “RNA (New York, N.Y.)” in our code. Thus this should be a problem on your side (sorry can’t help you further since I’m not that familiar with the journal abbreviation code). The “PloS” problem will be resolved in the next version with the PR. Thanks for reporting this issue!
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As for 1., we keep the format we get from medline. You can use JabRef’s Quality -> Cleanup functionality to automatically convert unicode characters to LaTeX (field formatter: “Unicode to LaTeX”).
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Having the DOI in the doi field and not as a url is the desired format. If you want your DOI’s to be clickable in the Latex-PDF, you have to slightly change the BibTeX style.
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These fields are returned from the medline api and thus are kept in the imported bibtex. The help contains a list of all supported fields. The PMID field usually should be exported, for example for “pmid = 27670948” it works. Can you please open a new issue on github and include the search query so that we can reproduce the issue (same for the missing “institution”).
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See 5., please report at github with more details. For example “pmid = 27670445” has a month.