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

Fixing a bug in unrecord

Edge reintroduction was happening while reintroducing parallel edges, which was confusing everything

Created by  pmeunier  on May 9, 2021
IXC43DSHDSXCE2X6H6N47GGVKTYM2D2BUUWF34CFWMFT6Z45NOOAC
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