[PATCH] Add exposed root option

[jesse at mbuki-mvuki.org (Jesse W. Hathaway)]

This patch allows you to expose the root read only, this
way you could upgrade the root filesystem without requiring
the user to reboot. The root filesystem could be kept on
an nfs volume or some other persistent medium. Multiple
clients could then be booted off the same root fs. I used
ltsp as a template to determine which directories to make rw.

This is the first cut, suggestions are welcome.

Bugs:

X will not work because xdebconfigurator uses debconf to
change values. You can still set things up manually with
X -configure

thanks,

Jesse
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