Add new man pages for livesys and voldump. Fix the man page for sys to say
what it actually does, rather than implying that it works like livesys, and
to recommend livesys instead. Fix a path error in the NetInfo
documentation. Update the README for the current status, including
listing all installed commands that don't have man pages. (There may still
be some subcommands that don't have man pages but aren't listed.)
