* new upstream point release.
  * Fix typo in remote branch example in git user manual (closes: #427502).
* debian/diff/0003-git-branch-track-fix-tracking-branch-computation.diff:
  remove; applied upstream.
* debian/versions.upstream: new; ordered list of upstream versions,
  starting with 1.0.0.
* debian/changelog.upstream.sh: new; create changelog.upstream from git
  shortlog using debian/versions.upstream.
* debian/changelog.upstream: re-created through changelog.upstream.sh.
* debian/diff/0003-git-svn-trailing-slash-in-prefix-is-mandatory-with.diff:
  new; git-svn: trailing slash in prefix is mandatory with --branches/-b
  (closes: #429443).