Add instructions.
Two minor changes.
List the parameters that are used to tailor a digest.
Fix typo in mode name.
Add reply files for partial digests (created by the set command)
and archive digests (created by the archive-get-digest command).
Add error files for the archive command.
Add format files for the archive-get and archive-get-digest commands.
Describe the TOTAL_POSTS and MESSAGECOUNT substitutions.
Remove "pre" tags from configuration comments.
Add a link to the archive summary.
Add a link that mails the archived message to the reader's address.
Allow the archive-get and archive-get-digest commands to work.
(_list_file_get_string)  Unlink the temporary file if substitutions
  are provided.
(archive_chunk)  Replaced hard-coded English with error files.
  Use digest_archive_preindex and related files to format digests
  retrieved by the archive-get-digest command.
(_digest_get_headers)  New method.  Retrieve headers from
  message_headers and other settings and perform variable substitutions.
(_set)  Use digest_partial_preindex and related files to
  format partial digests.
(archive)  Add format file support for the archive-get and
  archive-get-digest commands.
(configshow)  Convert comments from plain text to HTML for the
  web interfaces.
(do_digests)  Call _digest_get_headers to obtain headers.
(text_to_html)  New routine.  Convert text to HTML in a way
  that allows new line breaks.
(text_to_html)  Remove unwanted parenthesis.
Various corrections to cope with the new text_to_html conversions.
(text_to_html)  Minor adjustments for consistency.
Adjust the formatting of various files to account for the text_to_html
conversions.