[sugar] 9.1 Proposal: Update improvements

[C. Scott Ananian]

I'd like to make a presentation on how our current update mechanism
works, and outline a plan for some improvements.

    *  Real COW for pristine versions, allowing... ticket #3581
    * ...binary-diff updates over http (avoiding rsync in many cases)
ticket #4259, etc
    * Integration of core OS updates with software update control
panel: ticket #7618
    * Integration of software updates with notification system
    * Incremental updates of activity bundles (only changed files)
    * Send back statistical data when checking for updates (batmon,
etc) ticket #4594, ticket #6447
 --scott

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