[numpy/f20] (3 commits) ...Update to 1.8.1 bugfix release from master

[Orion Poplawski]

Summary of changes:

  ef86660... Fix __pycache__ ownership (bug #1072467) (*)
  d138f43... Update to 1.8.1 (*)
  d511cd7... Update to 1.8.1 bugfix release from master

(*) This commit already existed in another branch; no separate mail sent