[NEW] Option -s is added to portsreinstall-chroot(8).

[NEW] Option -s is added to portsreinstall-chroot(8).
fs_chk_mounted () is modified to return correct status.

 Changes to be committed:
	modified:   bin/portsreinstall-chroot
	modified:   etc/portsreinstall.conf
	modified:   lib/chroot/libcommand_do.sh
	modified:   lib/chroot/libfs.sh
	modified:   lib/chroot/liboptions.sh
	modified:   lib/chroot/libusage.sh
	modified:   lib/libfs.sh
	modified:   lib/libmain.sh
	modified:   lib/libpkgsys.sh
	modified:   man/portsreinstall-chroot.8
	modified:   man/portsreinstall.8