Update to 20010809.

pkg_deinstall:
	- Bring in most of the options of pkg_delete(1).
	- Add a new option `-P', which preserves shared libraries.
	- List failed packages if any.
	- Obsolete GNU style long options, which take space and would
	  only rarely be used.

portupgrade:
	- Make portupgrade use pkg_deinstall instead of pkg_delete, to
	  utilize its -P option.

	- Now portupgrade always uninstalls old packages, but
	  preserves shared libraries by default.  The -u option has
	  been changed to mean "Do not preserve old shared libraries".
	  Note, however, that its behavior is the same as before, it
	  is just the default behavior that has been changed.

	  With this change, portupgrade no longer leaves extra garbage
	  even if you don't specify -u, but only old versions of
	  shared libraries for safety. :)

	- Utilize $tmpdir properly for pkg_tarup. (previously
	  PKGREPOSITORY was used prior to PKG_TMPDIR or TMPDIR)

	- Add a notice regarding the disk space for backup files.

Since it's my birthday today, I just wish this update doesn't contain
terrible bugs.. ;)

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