Overcome backwards xl-id form by handling both #422
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This adds the "normal" form (used in XL) as a sameAs to generated records if they are to have the backwards form mistakenly minted by this repository.
An upper timestamp per dataset is used to check for if its member records are to have the backwards form.
(Eventually we want to "garbage collect" this backwards form from XL, to ensure they don't "squat" on XL id:s in the future.)