Merge commit 'lamby/master' into merge

* commit 'lamby/master':
  Fix return type.
  Don't call check_* due when we are running with No-Action
  While we're at it, split out another version of ensure_orig_files.
  check_lintian needs all the source, otherwise we can't check the package.
  Factor out symlink stuff from get_changelog_versions => ensure_all_source_exists

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