Bumbped the copyright year.

Bumbped the copyright year.

[BUG FIX] "Selection of removing leaf ports" might have failed at ports which has not been installed yet and becomes leaves by REPLACE_* tags in the configuration file.

Changes to be committed:
	modified:   COPYRIGHT
	modified:   INSTALL
	modified:   Makefile
	modified:   README
	modified:   bin/portsreinstall
	modified:   lib/libcommand.sh
	modified:   lib/libconf.sh
	modified:   lib/libdatabase_build.sh
	modified:   lib/libdatabase_query.sh
	modified:   lib/libdatabase_record.sh
	modified:   lib/libdeinstall.sh
	modified:   lib/libfileedit.sh
	modified:   lib/libmessage.sh
	modified:   lib/libmisc.sh
	modified:   lib/liboptions.sh
	modified:   lib/libpkgsys.sh
	modified:   lib/libprogram.sh
	modified:   lib/libreinstall.sh
	modified:   lib/libstr.sh
	modified:   lib/libtemp.sh
	modified:   lib/libusage.sh
	modified:   man/portsreinstall.8