[BibTeX] Move character mapping table to the end
[BibTeX] Fix author import/export
* Fixes import/export of 'Jr' as per https://forums.zotero.org/discussion/37289/bibtexbiblatex-importexport-and-the-jr-name-part/
* Fixes import of institutional authors with " and " in the name
[Bib(La)TeX] Add support for IDs stored in Extra
Update Extra handling in Web translators
[MathSciNet] Fix snapshots, detectWeb, and MR numbers
[arXiv.org] Clean up & fix support for eprintweb
Merge pull request #746 from aurimasv/bibtex-misc

BibTeX tweaks for names and MR/Zbl/identifier standardization across translators