Automatically fixup commits with related changes

 git-autofixup creates fixup commits from changes in the worktree. This can
 save the tedious work of amending fixes into the appropriate commits during
 codereview.
 .
 Changes to consider are parsed out of git-diff(1) and git-blame(1) is used to
 assign hunks to commits since the revision given on the commandline, which
 will typically represent a topic branch. Then it creates fixup commits to be
 used with git rebase --autosquash.