Eliminate carving whole file chunks during tests

    This is done with the below script and looking through the resulting git change.

    $ cat recreate_outputs.sh
    #!/bin/bash

    set -e

    cd tests/integration

    find -name __output__ | xargs rm -rf

    find -name __input__ |
        while read input; do
            (
            cd "$input"
            mkdir ../__output__
            cd ../__output__
            find ../__input__ -type f |
                while read fw; do
                    unblob --keep-extracted-chunks "$fw"
                done
            )
        done

    # empty, but extracted directories
    find -type d | rg __output__ |
        while read dir; do
            rmdir --ignore-fail-on-non-empty "$dir"
            if [ ! -d "$dir" ]; then
                mkdir "$dir"
                touch "$dir/.gitkeep"
            fi
        done

    git add .