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

Improve command feedback

Based on the comments from @pmeunier in #561, I have completely re-wrote the inital patch to use the writeln! rather than eprintln!. This patch adds some fairly simple output for commands so that the user knows something has happened rather than being given no output at all :)

Created by  finchie  on December 20, 2021
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