* Attempt to detect and disallow installation of a port with PREFIX

  set to a different value to that with which it was configured and
  built.  This is achieved by recording the PREFIX in the build-stage
  cookies [1]

* Add scheme [2], tcl84 and tk84 [5] as virtual categories

* Add the PERL_PORT variable and use it to register the dependency on
  the correct perl port when PERL_LEVEL is set [3]

* Add support for USE_AUTOHEADER [4]

* Fix 'make maintainer' when MAINTAINER is set to a bogus value (not
  in user@example.com format). [6]

* Add a 'package-recursive' target to create packages for a port and
  all of its dependencies [7]

* Fix command-line overflow errors in 'make readmes' on certain ports,
  with the bonus of providing a measurable speed-up to readme
  generation [8]

* Fix inclusion of alternative makefiles such as Makefile.inc,
  Makefile.local, etc. (broken since 1.403) [9]

* Reintroduce support for install/deinstall targets checking for older
  versions of the port, and re-add the deinstall-all target that
  removes all existing installations of a port (originally introduced
  in 1.446 and backed out in 1.450).  This patch has been reworked to
  eliminate the corner cases in the previous code.  Ports that
  dynamically generate their ${PLIST} at install-time must now do so
  before the do-install target is run, e.g. in pre-install.  [10]

* When installing ports as non-root, use su(1) to execute the targets
  that require root privilege.  This is achieved by splitting up the
  _INSTALL_SEQ target list into _INSTALL_SUSEQ [11].

PR:		23581 [1], 47238 [2], 48465 [3], 50165 [4], 51985 [6],
		52388 [7], 51609 [11]
Submitted by:	Matt Emmerton <matt@gsicomp.on.ca> [1],
		Sergey Matveychuk <sem@ciam.ru> [1] [7] [10] [11],
		Kimura Fuyuki <fuyuki@hadaly.org> [2],
		"Scot W. Hetzel" <hetzels@westbend.net> [3],
		Anton Berezin <tobez@FreeBSD.org> [3], nork [4],
		hsu [5], Mark Linimon <linimon@lonesome.com> [6],
		hoek [8], sobomax [9], marcus [10] [11], des [11]

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