[Piuparts-devel] next batch for 0.74

[Andreas Beckmann]

Andreas Beckmann (7):
      Makefile: add check-whitespace target
      p.conf.anbe: [sid-ipi]
      scripts/post_setup_minimize: new custom script to minimize chroots
      scripts/post_setup_dummy_users: block uids likely being used by the host
      kpr/needs_rebuild_issue: "called emacs-package-install as a new-style add-on, but has no compat file"
      drop scripts/post_distupgrade_experimental
      changelog updates, rewording