Bibliography deduplicator

Everything runs in this tab. No record is uploaded, and no DOI or title is looked up online, so a reference can only match another reference that is in the paste. The parser is tolerant, not certified: standard BibTeX entries and RIS tag lines read fine, exotic macros and nonstandard dialects may not. Title similarity compares cleaned plain letters of both titles, so LaTeX accent commands are ignored rather than interpreted. The clean library downloads as BibTeX, with RIS records converted and citation keys made unique.