[IMPROVED] Adapt to the behavior change grep(1) as of 12.0-RELEASE that the case...

[IMPROVED] Adapt to the behavior change grep(1) as of 12.0-RELEASE that the case distinction is ineffective in some locale, which as a result prevented the execution by users in such locales.
[BUG FIX] Directories mounted by ZFS were not correctly treated by portsreinstall-chroot(8).
[BUG FIX] The mount command of portsreinstall-chroot(8) failed if the base directory path is under a directory to be mounted for the chroot environment (ex. when /home is a link to /usr/home).
[BUG FIX] Restarted runs failed if paths set to option values or their parent paths are symbolic links.
[BUG FIX] The mount command of portsreinstall-chroot(8) failed to detect mounted and unmounted file systems on mount points under symbolic links.

 Changes to be committed:
	modified:   HISTORY
	modified:   lib/chroot-mount/liboptions.sh
	modified:   lib/chroot/libfs.sh
	modified:   lib/chroot/liboptions.sh
	modified:   lib/libcommand_do.sh
	modified:   lib/libcommand_flexconf.sh
	modified:   lib/libcommand_forget.sh
	modified:   lib/libcommand_pkgs.sh
	modified:   lib/libconf.sh
	modified:   lib/libdatabase_build.sh
	modified:   lib/libdatabase_maintain.sh
	modified:   lib/libdatabase_query.sh
	modified:   lib/libdatabase_record.sh
	modified:   lib/libdeinstall.sh
	modified:   lib/libfileedit.sh
	modified:   lib/libfs.sh
	modified:   lib/libmain.sh
	modified:   lib/libmisc.sh
	modified:   lib/liboptions.sh
	modified:   lib/libpkgsys.sh
	modified:   lib/libprogram.sh
	modified:   lib/libreinstall.sh
	modified:   lib/main/liboptions.sh
	modified:   lib/upgrade/libcommand_do.sh
	modified:   lib/upgrade/liboptions.sh
	modified:   man/portsreinstall-chroot.8