Add portupgrade, a tool to upgrade installed packages with ports.

It upgrades ports without reinstalling dependent packages by directly
modifying the package info recorded in the files under /var/db/pkg.

e.g.
	portupgrade gtk
	portupgrade -cC gnome\*

It currently has many design flaws (to me at least) but I am releasing
this because it's functionally stable enough to use. (I believe.. ;)

Use with care, at your own risk.

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diff --git a/ports-mgmt/portupgrade-devel/pkg-descr b/ports-mgmt/portupgrade-devel/pkg-descr
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+Portupgrade is a tool to upgrade installed packages with ports.
+
+It upgrades ports without reinstalling dependent packages by directly
+modifying the package info recorded in the files under /var/db/pkg.
+
+The procedures it takes is shown as follows:
+
+    1.  Build the corresponding port of the given package
+
+    2.  Fix the dependency info of the ones which depends on the given
+        package
+
+    3.  Save the +REQUIRED_BY list of the given package
+
+    4.  Uninstall the given package forcibly if -u is specified
+
+    5.  Install the port
+
+    6.  Restore the +REQUIRED_BY list
+
+The usage can be shown by running it without arguments or with a -h.
+
+Author:	Akinori MUSHA <knu@FreeBSD.org>