Merge branch 'jc/builtin-n-tar-tree'

Merge branch 'jc/builtin-n-tar-tree'

This pulls in "make many commands built-in" branches.

* jc/builtin-n-tar-tree:
  built-in tar-tree and remote tar-tree
  Builtin git-diff-files, git-diff-index, git-diff-stages, and git-diff-tree.
  Builtin git-show-branch.
  Builtin git-apply.
  Builtin git-commit-tree.
  Builtin git-read-tree.
  Builtin git-tar-tree.
  Builtin git-ls-tree.
  Builtin git-ls-files.