Merge remote-tracking branch 'origin/proposed-updates/debian/buster/633fb016' into apertis/v2020dev0

Signed-off-by: Andrej Shadura <andrew.shadura@collabora.co.uk>

Signed-off-by: Andrej Shadura <andrew.shadura@collabora.co.uk>

  * python-minimal: Make the python-central conflict unversioned.
    Closes: #910234.

  * Fix pyversions -d invocation. Closes: #900983.

 -- Matthias Klose <doko@debian.org>  Thu, 07 Jun 2018 18:57:11 +0200

  * Don't install the pyclean and pycompile manpages in python-minimal.
  * Don't install dh_python2 manpage in python.
  * Remove unused xsl files, remove unused code in the rules file.

 -- Matthias Klose <doko@debian.org>  Wed, 06 Jun 2018 23:25:58 +0200

  * Split out a set of python2 packages, and let the python packages depend on
    it. No changes for the "-all" packages.

    - add Cnf-Visible-Pkgname hint to ensure command-not-found recommends
      installing "python" instead of "python-minimal" when it is missing.

  * README.Debian: Reference 2.7 and point to the python3 package for the
    Debian Python Policy.
  * Mark python-examples as M-A: foreign.

    against people fiddling around with the python symlink or having a 
    python3 installed as python in /usr/local. LP: #1715062.

    Closes: #872421.

  * Bump debhelper version.