The preceding commit uses <systemitem> elements to mark the lfs
user and group in commands. Unfortunately, this change the
rendering in html, because now lfs appears in an italic font.
Using <userinput remap='group'> or <userinput remap='user'> allows
parsing the XML for jhalfs, but does not change the html rendering.
I still think it's cleaner for jhalfs to just use a different user name
(for example "lfs1") if the user lfs already exists. This will allow
jhalfs to easily use a different user name.
So if the user has not set $LFS properly, chown will do nothing instead
of wreak havoc in the host distro.
--from <user> has been available for Coreutils chown since 2000 so we
don't need to raise the host system requirement.
