Merge branch 'nd/worktree-cleanup-post-head-protection'

Further preparatory clean-up for "worktree" feature continues. * nd/worktree-cleanup-post-head-protection: worktree: simplify prefixing paths worktree: avoid 0{40}, too many zeroes, hard to read worktree.c: use is_dot_or_dotdot() git-worktree.txt: keep subcommand listing in alphabetical order worktree.c: rewrite mark_current_worktree() to avoid strbuf completion: support git-worktree