Make layout default Dirname() consistent
Make layout default Dirname() consistent

Always return a trailing slash now.

middelink/restic,jayme-github/restic,jayme-github/restic,kurin/restic,fawick/restic,middelink/restic,ar-jan/restic,restic/restic,restic/restic,fawick/restic,kurin/restic,ar-jan/restic