(bibtex-entry-type-whitespace)

(bibtex-entry-type-whitespace)
(bibtex-entry-type-str, bibtex-empty-field-re)
(bibtex-search-backward-string, bibtex-preamble-prefix)
(bibtex-search-entry, bibtex-enclosing-entry-maybe-empty-head):
Removed.
(bibtex-any-valid-entry-type): New variable.
(bibtex-parse-field-name): Simplify.
(bibtex-parse-string, bibtex-search-forward-string): New arg
empty-key.
(bibtex-preamble-prefix): Include left delimiter.
(bibtex-search-forward-field, bibtex-search-backward-field): Allow
unbounded search past entry boundaries (required by bibtex-pop).
(bibtex-text-in-field-bounds): Use push.
(bibtex-text-in-field): Do not use bibtex-narrow-to-entry.
(bibtex-parse-preamble, bibtex-valid-entry)
(bibtex-beginning-first-field): New functions.
(bibtex-skip-to-valid-entry): Use bibtex-valid-entry.  Fix regexp.
(bibtex-map-entries): Fix docstring.
(bibtex-flash-head): New arg prompt. Simplify.
(bibtex-enclosing-field): Include code of bibtex-inside-field.
(bibtex-insert-kill): Simplify.  Always insert text past the
current field or entry.
(bibtex-format-entry): Use bibtex-parse-field.
(bibtex-pop): Use bibtex-beginning-of-entry and
bibtex-end-of-entry to initiate the search.  Insert empty field if
we found ourselves.
(bibtex-print-help-message): New args field and comma.  Handle
entry keys.
(bibtex-make-field): Use bibtex-beginning-of-entry.
(bibtex-end-of-entry): Use bibtex-valid-entry.  Recognize any
invalid entry.
(bibtex-validate): Use bibtex-valid-entry and bibtex-parse-string.
Handle preambles.  Simplify code for thorough test.
(bibtex-next-field, bibtex-find-text, bibtex-find-text-internal):
New arg comma.  Handle entry heads.
(bibtex-remove-OPT-or-ALT, bibtex-remove-delimiters)
(bibtex-kill-field, bibtex-copy-field-as-kil, bibtex-empty-field):
New arg comma.
(bibtex-kill-entry): Use bibtex-any-entry-maybe-empty-head.
(bibtex-fill-field): Simplify.
(bibtex-fill-entry): Use bibtex-beginning-first-field and
bibtex-parse-field.
(bibtex-convert-alien): Do not wait before calling
bibtex-validate.
(bibtex-complete): Use bibtex-parse-preamble.