* Merge with Debian Unstable, Ubuntu changes:
  - use our xfce.mk class
  - debian/control: remove quilt and chrpath build-dependencies and add cdbs
  - Adhere to DebianMaintainerField
  - debian/patches/series: dropped, we use simple-patchsys
  - debian/patches/01_lower-margins-in-launchers.patch: dropped
  - debian/xfce4-panel.1: update bug reporting (LP instead of Debian BTS)
  - debian/compat: bump to 5
  - Homepage, XS-Vcs-Bzr & XS-Vcs-Browser fields added
  - debian/xfce4-panel.install: drop usr/share/man to fix FTBFS.
* Drop uneeded delta with Debian: rename debian/patches/01_fix-segfault-with-2nd-panel.patch
  to debian/patches/02_fix-segfault-gtk2.11.patch.
* debian/control: use Vcs-* instead of XS-Vcs-*.