Revocation.from_signed_raw() do not stores timestamps into a BlockUID object
From silkaj!170 (comment 26657) & silkaj!170 (comment 26658)
from_signed_raw() methods from Membership, Identity, and Certification classes store timestamps into a BlockUID object. This is not the case of Revocation.from_signed_raw(). Let's make it consistent and more convenient to use.
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