Activity Backward Compatibility (was re: Re: joyride 2128 smoketest)

[C. Scott Ananian]

The general solution to this problem is trac #4951, the activity
updater, which I've landed recently.  Trac #7495 says that the first
boot after an upgrade should open the activity updater, so that a
version of the activity compatible with the new OS can be installed if
necessary.  The activity update protocol understands simple base OS
dependencies, so that you can specify a different version for 8.1 and
8.2 (for example).  The [[Activity_bundles]] wiki page documents the
update_url tag.
  --scott

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