(bibtex-autokey-titleword-ignore): Regexp is used in a case insensitive env.
(bibtex-mode-map): Rearrange order of menus.
(bibtex-quoted-string-re): Obsolete.
(bibtex-complete-key-cleanup): Variable replaced by new function.
(bibtex-font-lock-keywords): Use backquotes.
(bibtex-font-lock-url-regexp): New internal variable.
(bibtex-name-in-field): New opt arg remove-opt-alt to remove "OPT" and "ALT".
(bibtex-insert-current-kill, bibtex-make-field)
(bibtex-prepare-new-entry, bibtex-yank-pop, bibtex-String): Use unless.
(bibtex-parse-field-text): Simplify.
(bibtex-string=): New helper function.
(bibtex-member-of-regexp): Merge with bibtex-autokey-get-title.
(bibtex-map-entries): Use bibtex-string=.
(bibtex-search-entry): Use not.
(bibtex-enclosing-field): Fix docstring.
(bibtex-assoc-regexp): Obsolete.
(bibtex-format-entry): Use assoc-string and bibtex-string=.
(bibtex-autokey-get-names): Handle empty name field.
(bibtex-parse-strings): Use assoc-string and unless.
(bibtex-complete-string-cleanup): Expansion list is passed as an argument.
Use assoc-string.
(bibtex-pop): Simplify.
(bibtex-mode): Set font-lock-extra-managed-props.
(bibtex-entry-update): Use assoc-string.
(bibtex-parse-entry): Remove "OPT" and "ALT" from FIELD.
(bibtex-autofill-entry): Use bibtex-string=.
(bibtex-print-help-message): Simplify.
(bibtex-find-entry): New optional arg START.
(bibtex-validate): Use bibtex-string= and assoc-string.
Do not call obsolete function compilation-parse-errors.
(bibtex-remove-delimiters): Only remove delimiters if present.
(bibtex-copy-entry-as-kill): Add docstring.
(bibtex-clean-entry): Use bibtex-string=. Handle empty keys.
Detect duplicate keys if bibtex-maintain-sorted-entries is nil.
(bibtex-complete): Use bibtex-predefined-month-strings,
bibtex-string=, and new function bibtex-complete-key-cleanup.
(bibtex-generate-url-list): New variable.
(bibtex-url): New command bound to C-c C-l and mouse-2.
(bibtex-url-map): New local keymap for bibtex-url-mouse.
(bibtex-font-lock-url): New function.
