[NEW] show heritage command is added. The database records ports which have not eithe...

[NEW] show heritage command is added. The database records ports which have not either upgraded or resinatlled in a reset-safe directory. Some reset-safe databases are added/corrected.

Other miscellaneous changes are included.

 Changes to be committed:
	modified:   Makefile
	modified:   bin/portsreinstall
	modified:   bin/portsreinstall-chroot
	modified:   etc/portsreinstall.conf
	modified:   lib/chroot-mount/libmain.sh
	modified:   lib/chroot/libcommand.sh
	modified:   lib/chroot/libmain.sh
	modified:   lib/libcommand.sh
	modified:   lib/libcommand_show.sh
	modified:   lib/libdatabase_maintain.sh
	modified:   lib/libdatabase_query.sh
	modified:   lib/libmain.sh
	modified:   lib/libpkgsys.sh
	modified:   lib/libreinstall.sh
	modified:   lib/libtemp.sh
	modified:   lib/main/libcommand.sh
	new file:   lib/main/libmain.sh