[sugar] Activity versioning schema

[Benjamin M. Schwartz]

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Eben Eliason wrote:
| I guess the point here is that performing intelligent string comparisons on
| several of these schemes requires parsing the string. ;)

I would be happy to whip up a universal approximate ordering for version
strings in a few lines of Python.  My emphasis here is on _approximate_;
nothing should depend on precisely correct interpretation of version strings.

- --Ben
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