(bibtex-progress-message): Fix docstring.

(bibtex-progress-message): Fix docstring.
(bibtex-entry-update): New command bound to C-c C-u.
(bibtex-text-in-string): Fix regexp.
(bibtex-assoc-of-regexp): Remove.
(bibtex-progress-message): Fix docstring.
(bibtex-inside-field): Use if.
(bibtex-assoc-regexp): New function.
(bibtex-format-entry): Make code more robust so it formats also old entries.
(bibtex-autokey-demangle-title): Merge with obsolete function
bibtex-assoc-of-regexp.
(bibtex-field-list): New function.
(bibtex-entry): Use bibtex-field-list.
(bibtex-parse-entry): Fix docstring.
(bibtex-print-help-message): Use bibtex-field-list.
(bibtex-make-field): Use bibtex-field-list.
(bibtex-entry-index): Bugfix. Return crossref key if required.
(bibtex-lessp): Fix docstring.