typos submitted by Arnaud Launay and Guillaume Valadon
Note the effect of this setting upon archived copies.
Add format files for the help, post, and put commands.
Change bare ampersands to SGML entities.  Thanks to Mathieu Arnold.
Correct typos.
Add a form that allows a different domain to be administered.
Expand the instructions.
Document the setting checkbox substitutions.
Preformatting command results is no longer necessary
  in the mj_confirm and mj_wwwusr interfaces.
Give precedence to query data over path info in
  determining the domain.
Escape data more consistently to avoid vulnerabilities.
Make the "surrender" output more consistent.
(standard_subs)  If the list name is invalid, the LIST substitution
  is set to the empty string.
(list_access_check)  Test admin passwords against the sessionuser.
  Thanks to Nick Simicich.
(_validate)  Initialize lengths to avoid warnings.
(parse_address)  Bugfix:  Use a callback to determine the
  "whereami" domain.
(parse_attachment_filters)  Support the "clean" action,
  which sanitizes HTML.
(help, post, put)  Add format file support.
(show)  Add *_CHECKBOX substitution support for personal settings.
(escape, uescape, qescape)  Return the empty string in response
  to undefined input.
(_r_strip_body, _clean_text)  Support the "clean" attachment filter,
  which removes potentially dangerous content from text/html body parts.
(clean_html)  Given a file containing HTML and lists of unwanted
attributes and elements, remove them from the file.
Document the "clean" action.
The order of ways to determine the domain has changed; query data
take precedence over the path info.
keeping up to date