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pkgtool.sh:pkgtool{,p_mirror}(): split -m <dname1>,<dname2> into -m <dname> -M <dname> for convenience. subr/pkgtool_init.subr: split -m <dname1>,<dname2> into -m <dname> -M <dname> for convenience. etc/{pkgtool.usage,README.md}: updated.