* Merge from Debian unstable. (LP: #1388425) Remaining changes:
  - debian/patches/use-stable-libsecret.patch:
    + Use the stable libsecret.
  - debian/patches/use_valid_help_url:
    + Let help buttons point to valid documentation references.
  - debian/control:
    + Update Vcs-* field.
* New upstream release.
* Drop debian/patches/fix-desktop-path.patch
  - no longer needed, fixed properly upstream.