* debian/rules:

  - Fixed lintian warnings "debian/rules ignores make errors".
* debian/control:
  - Substituted outdated "Source-Version" fields with "binary:Version".
  - Added 'python-apt' to Suggests, as apt-mark need it for work.
  - Drop Debian revision from 'doc-base' build dependency, this fixes
    appropriate lintian warning.
* debian/libapt-pkg-doc.doc-base.*:
  - Changed section: from old 'Devel' to 'Debian'. This fixes appropriate
    lintian warnings.
* debian/{postrm,prerm,preinst}:
  - Added 'set -e', fixes lintian warnings
    'maintainer-script-ignores-error'.
* dselect/makefile:
  - Removed unneeded 'LOCAL' entry. This allows cleaning rule to run smoothly.
* share/lintian-overrides:
  - Added with override of 'apt must depend on python'. Script 'apt-mark'
    needs apt-python for working and checks this on fly. We don't want
    python in most cases.
* cmdline/apt-key:
  - Added 'unset GREP_OPTIONS' to the script. This prevents 'apt-key update'
    failure when GREP_OPTIONS contains options that modify grep output.
    (Closes: #428752)