A generic CSV export filter that exports all standard BibTeX fields as-is.

The exported file contains a header row with field names, followed by one row
per entry. All standard fields are included as columns:

  Citation Key, Author, Title, Year, Journal, Booktitle, Publisher, Volume,
  Number, Pages, Month, Edition, Address, Editor, Series, Note, HowPublished,
  Organization, Institution, School, DOI, URL, Keywords, Abstract, ISBN, ISSN

This filter is intended as a simple, general-purpose CSV export suitable for
use in spreadsheet applications such as Microsoft Excel or LibreOffice Calc.
