Resolve "Ligo test: Timestamp arithmetic returns 'Unbound primitive' error"

also removed Int_repr_copied which was historical. This way int and timestamp are easier to add/sub

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Closes #1277 (closed)

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• 860f7177 - testing framework: cleanup historical Int_repr_copied (use Z.t all the way)

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• e7ffca6c - testing framework: add timestamp arithmetic

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• 7a5ab8ce - changelog

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mentioned in commit 203ef973

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