Merge branch 'maint'

Merge branch 'maint'

* maint:
  Further 1.5.3.5 fixes described in release notes
  Avoid invoking diff drivers during git-stash
  attr: fix segfault in gitattributes parsing code
  Define NI_MAXSERV if not defined by operating system
  Ensure we add directories in the correct order
  Avoid scary errors about tagged trees/blobs during git-fetch