Clean up date and timezone handling. We used to pass changelog dates around as a "unixtime timezone" string containing a pair of encoded ints. Now, they get passed around as a (unixtime, timezone) tuple of numbers, which makes much more sense.

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merge: warning: conflicts during merge

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merging a

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merging a failed!

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32e80765d7fe+75234512624c+ tip

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something else

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something

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