Merge commit 'sec-merge' into security

* commit 'sec-merge': (29 commits)
  Cleanup
  Cleanup
  Cleanup in check_archives
  pychecker cleanup
  "Fake" a changelog entry for Mark
  Do not allow o-p-u-new to break dinstall
  WTF? rm -f ? WTF?
  Revert examine_package.py, which was broken
  clean up pychecker warnings
  clean up pychecker warnings
  clean up pychecker warnings
  clean up pychecker warnings
  clean up pychecker warnings
  clean up pychecker warnings
  clean up pychecker warnings
  clean up pychecker warnings
  clean up pychecker warnings
  clean up pychecker warnings
  clean up pychecker warnings
  fix the simpler of the pychecker errors
  ...

Signed-off-by: Joerg Jaspert <joerg@debian.org>