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at ':' characters by call to split-string.

Added RCS version identification.

Some temporary comments removed.
(bibtex-field-name, bibtex-entry-type): Made the relationship
explicit.
(bibtex-field-const): Allow capital letters.
(bibtex-start-of-string): Deleted because unused.

Unified some nomenclature.  We no longer
use the term 'reference' to describe a bibtex entry as a whole.
Further, reference keys are no longer called 'labels'.
(bibtex-keys): Renamed to bibtex-reference-keys.
(bibtex-reformat-previous-labels): Renamed to
bibtex-reformat-previous-reference-keys.
(bibtex-reference-type): Renamed to bibtex-entry-type.
(bibtex-reference-head): Renamed to bibtex-entry-head.
(bibtex-reference-maybe-empty-head): Renamed to
bibtex-entry-maybe-empty-head.
(bibtex-key-in-reference): Renamed to bibtex-key-in-entry.
(bibtex-search-reference): Renamed to bibtex-search-entry.
(bibtex-enclosing-reference-maybe-empty-head): Renamed to
bibtex-enclosing-entry-maybe-empty-head.
(bibtex-entry-field-alist, bibtex-entry-head,
bibtex-font-lock-keywords, bibtex-skip-to-valid-entry,
bibtex-map-entries, bibtex-search-entry,
bibtex-enclosing-entry-maybe-empty-head, bibtex-format-entry,
bibtex-generate-autokey, bibtex-parse-keys, bibtex-pop, bibtex-mode,
bibtex-submit-bug-report, bibtex-entry, bibtex-print-help-message,
bibtex-make-field, bibtex-end-of-entry, bibtex-sort-buffer,
bibtex-find-entry-location, bibtex-validate, bibtex-find-text,
bibtex-kill-entry, bibtex-clean-entry, bibtex-reformat,
bibtex-complete-key, bibtex-String) : Use the new nomenclature.

(bibtex-strings, bibtex-keys): Removed redundant
comment.
(bibtex-format-field-delimiters): New function, functionality
extracted from bibtex-format-entry.
(bibtex-autokey-get-yearfield-digits): New function, functionality
extracted from bibtex-autokey-get-yearfield.

Completely reimplemented parsing of bibtex
entries in order to avoid stack overflow in the regexp matcher if
field contents become large.
(bibtex-cfield, bibtex-name-in-cfield, bibtex-text-in-cfield,
bibtex-field-string-part-not-braced,
bibtex-field-string-part-no-inner-braces,
bibtex-field-string-part-1-inner-brace,
bibtex-field-string-part-2-inner-braces,
bibtex-field-string-part-3-inner-braces, bibtex-field-string-braced,
bibtex-field-string-quoted, bibtex-field-string,
bibtex-field-string-or-const, bibtex-field-text, bibtex-field,
bibtex-name-in-field, bibtex-text-in-field, bibtex-reference-infix,
bibtex-string, bibtex-key-in-string, bibtex-text-in-string): Deleted
as parsing is now performed by the following functions.
(bibtex-parse-nested-braces, bibtex-parse-field-string-braced,
bibtex-parse-quoted-string, bibtex-parse-field-string-quoted,
bibtex-parse-field-string, bibtex-search-forward-field-string,
bibtex-parse-association, bibtex-field-name-for-parsing,
bibtex-parse-field-name, bibtex-parse-field-text, bibtex-parse-field,
bibtex-search-forward-field, bibtex-search-backward-field,
bibtex-start-of-field, bibtex-end-of-field,
bibtex-start-of-name-in-field, bibtex-end-of-name-in-field,
bibtex-start-of-text-in-field, bibtex-end-of-text-in-field,
bibtex-parse-string-prefix, bibtex-parse-string-postfix,
bibtex-parse-string, bibtex-search-forward-string,
bibtex-search-backward-string, bibtex-start-of-string,
bibtex-end-of-string, bibtex-start-of-reference-key-in-string,
bibtex-end-of-reference-key-in-string, bibtex-start-of-text-in-string,
bibtex-end-of-text-in-string): New functions for the parsing of bibtex
entries.  Instead of reporting the results of the parsing by
match-beginning or match-end, these functions return data structures
that hold the corresponding positions.
(bibtex-enclosing-field): Changed to also report field boundaries by
return values rather than by match-beginning or match-end.  The
following functions have been adapted to use the new parsing
functions.
(bibtex-skip-to-valid-entry, bibtex-search-reference,
bibtex-enclosing-field, bibtex-format-entry,
bibtex-autokey-get-namefield, bibtex-autokey-get-titlestring,
bibtex-parse-keys, bibtex-complete, bibtex-pop, bibtex-mode,
bibtex-print-help-message, bibtex-end-of-entry,
bibtex-ispell-abstract, bibtex-validate, bibtex-next-field,
bibtex-find-text, bibtex-remove-OPT-or-ALT, bibtex-remove-delimiters,
bibtex-kill-field, bibtex-empty-field, bibtex-fill-entry): Use the new
method for parsing.
(bibtex-assoc-of-regexp, bibtex-skip-to-valid-entry,
bibtex-map-entries, bibtex-flash-head,
bibtex-enclosing-reference-maybe-empty-head, bibtex-format-entry,
bibtex-autokey-change, bibtex-autokey-get-namefield,
bibtex-autokey-get-names, bibtex-autokey-get-titlestring,
bibtex-autokey-get-titles, bibtex-parse-keys, bibtex-pop, bibtex-mode,
bibtex-end-of-entry, bibtex-ispell-abstract, bibtex-sort-buffer,
bibtex-validate, bibtex-remove-OPT-or-ALT, bibtex-remove-delimiters,
bibtex-kill-field, bibtex-kill-entry): Use let* instead of let in
order to make the new binding of case-fold-search immediately
visible.

Copyright notice is up to date.
Added constant 'bibtex-maintainer-salutation.

(bibtex-mode): use with-temp-buffer rather
than make-temp-name, use match-string-no-properties and eliminate
a quadratic behavior when building bibtex-strings.

(bibtex-reference-key): Accept string entries whose
reference key contains upper case letters.

(bibtex-reference-head): Allow entries to start with
a new line.

Hiding of entry bodies is not longer provided by
bibtex.el directly.  Instead the hideshow package can be used.
Added a special bibtex entry to hs-special-modes-alist.
(bibtex-hs-forward-sexp): Added for hideshow.el.

(bibtex-entry-field-alist): Added booktitle field to
proceedings entry type (for cross referencing). Thanks to
Wagner Toledo Correa for the suggestion.

Added `reftex-view-crossref-from-bibtex' to menu.