Peru Upgrade process.

[Benjamin M. Schwartz]

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I don't really know enough to comment correctly on this debate, but it
sure seems like the much-maligned USB autoreinstallation system meets all
the requirements.  It is non-interactive, beyond requiring a reboot, and
it preserves the user's data by copying off the contents of /home/olpc,
performing the upgrade, and then copying back the contents of /home/olpc.

- --Ben
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