Matches https://github.com/ilyagr/pijul-clone as of now, might become out of sync

Add a prefix in `pijul archive` in all cases

Created by  pmeunier  on January 8, 2021
BY5FVZAV5547DIQAPCGBNDT45SC4CAH7CGC7W3ZWH6XEX6S22GOQC
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