Implement bibtex keywords field <-> org-mode tags
* lisp/org-bibtex.el (org-bibtex-tags): New variable
(org-bibtex-tags-are-keywords): New variable
(org-bibtex-no-export-tags): New variable
(org-bibtex-headline): Export tags as comma-separated bibtex keywords
(org-bibtex-read): Import bibtex keywords field as tags
Bibtex users often rely on the keywords field to tag their entries.
With biblatex, the keywords field can be used to organize and filter
bibliographic entries. This patch adds an option to import keywords as
org-mode tags, and to export tags as bibtex keywords.
It also adds an option to add user-defined tags to newly created bib
headlines.