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

Splitting the WorkingCopy trait into a read-only record and a read/write output

Created by  pmeunier  on September 9, 2021
7KNPYIDUXCBZ65NA74NL2DIFS6STJWN4XXHXLTIV5QXZSVLARJMAC
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