Update to 20010627. Enhance the behaviors of some flags:

    -B CMD
    --beforebuild CMD	Run the sapecified command before each build.  If the
			command exits in failure, the port/package will be
			skipped.  Here is some typical uses:

			portupgrade -B 'cvs update' 'gnome*'

			portupgrade -aB 'test ! `make -V IS_INTERACTIVE`'

    -x GLOB
    --exclude GLOB	Exclude packages matching the specified glob pattern.
			Exclusion is performed after recursing dependency in
			response to -r and/or -R, which means, for example,
			the following command will upgrade all the packages
			depending on XFree86 but leave XFree86 as it is:

			portupgrade -rx XFree86 XFree86

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