org-bibtex: translating between Org-mode headings and Bibtex entries

org-bibtex: translating between Org-mode headings and Bibtex entries

* lisp/org-bibtex.el: Updating Copyright dates, author information,
  commentary and history notes.
  (org-bibtex-types): List of bibtex types with descriptions and
  required and optional fields.
  (org-bibtex-fields): List of bibtex fields with descriptions.
  (*org-bibtex-entries*): Special variable to hold parsed bibtex
  entries.
  (org-bibtex-autogen-keys): Custom variable controlling whether
  bibtex keys are automatically generated
  (org-bibtex-prefix): Custom variable allowing use of optional prefix
  for bibtex properties in Org-mode headlines.
  (org-bibtex-get): Helper function for accessing bibtex elements of a
  property list.
  (org-bibtex-put): Helper function for inserting bibtex element into
  a property list.
  (org-bibtex-headline): Return a bibtex entry of the given headline
  as a string.
  (org-bibtex-ask): Prompt the user to fill in the value of a bibtex
  field.
  (org-bibtex-autokey): Generate a bibtex key for the current
  headline.
  (org-bibtex-fleshout): Fill in missing bibtex properties of the
  current headline.
  (org-bibtex): Export the current Org-mode buffer to a bibtex buffer.
  (org-bibtex-check): Check that all bibtex properties are present in
  the current headline.
  (org-bibtex-check-all): Check all headlines in the current buffer.
  (org-bibtex-create): Create a new bibtex headline at the current
  level.
  (org-bibtex-read): Read the current bibtex entry from a bibtex file.
  (org-bibtex-write): Write the most recently read bibtex entry into
  an Org-mode file.