* Merge Xfce 4.6.0 final with Debian experimental, remaining Ubuntu changes:
  - debian/control: added gtk-doc-tools to build-deps
  - debian/rules: pass --enable-gtk-doc to ./configure
  - debian/patches:
    + 01_add-xubuntu-in-config-dirs.patch: append "/etc/xdg/xubuntu" to the
      list of config directories
    + 02_add-mythbuntu-in-config-dirs.patch: append "/etc/xdg/mythbuntu" to
      the list of config directories
    + series:
      . don't apply 01_add-desktop-base-in-config-dirs.patch
      . refreshed.