This is Niels Thukier's wording, with grammar fixes from me and an
"i.e." clause from David Bremner.

Drop footnote giving the version of dpkg required to automatically add
the field, since that version is older than the version in oldstable.

This reverts commit 7ee2f2a6.

This reverts commit 4b39eb3f.

Not necessarily the author of the text.

Wording by Jonathan Nieder.

The same change as for the main Policy document: change the anchor
text to be the full URL instead of a Debian mirror path (which may be
out of date).

* Convert many of the <screen> tags in Policy to </programlisting> since
  the semantics are slightly more correct.
* Remove the newline before </screen> or </programlisting> end tags,
  since it produces an extraneous and distracting blank line in both
  text and HTML output.
* Change the mapping of Perl module names to Debian package names in
  the Perl Policy from a verbatim block to a table.
* Change the list of cron directories from a verbatim block to a list.

Clarify that priorities are used only for determining the contents
of a Debian installation, and the majority of packages should have
a priority of optional.

Deprecated extra in favor of using optional, and allow optional
packages to conflict with each other.

Require that packages with a priority of standard or higher not
conflict with each other.

Remove the requirement that packages not depend on a packag with a
lower priority, and instead state that priorities are based solely
on the directly-provided functionality.  Carve out an exception for
installer maintainers to mess with priorities to fix installer issues.

The restrictions on not using environment variables refers to custom
environment variables (not, say, a sensible PATH), and only applies to
programs installed on the system PATH.

Also update the wording to reflect that /etc/profile.d is now available,
but still cannot be used for this purpose.  Remove the paragraph
explaining that /etc/profile is a base-files configuration file, since
/etc/profile.d solves that problem and it's not the point.

The DocBook conversion set these field names off in quotes, but
we use <literal> everywhere else in Policy.  Be consistent.