Merge branch 'es/worktree-repair'

"git worktree" gained a "repair" subcommand to help users recover after moving the worktrees or repository manually without telling Git. Also, "git init --separate-git-dir" no longer corrupts administrative data related to linked worktrees. * es/worktree-repair: init: make --separate-git-dir work from within linked worktree init: teach --separate-git-dir to repair linked worktrees worktree: teach "repair" to fix outgoing links to worktrees worktree: teach "repair" to fix worktree back-links to main worktree worktree: add skeleton "repair" command