Merge branch 'jk/bisect-final-output'

The final report from "git bisect" used to show the suspected culprit using a raw "diff-tree", with which there is no output for a merge commit. This has been updated to use a more modern and human readable output that still is concise enough. * jk/bisect-final-output: bisect: make diff-tree output prettier bisect: fix internal diff-tree config loading bisect: use string arguments to feed internal diff-tree