* Merge from Debian unstable. Remaining changes:
  - debian/control:
    + Build-depend on dh-autoreconf and xdt-autogen.
    + Add light-locker-settings | xfce4-power-manager to Recommends.
  - debian/patches/lid-closed.patch: Take patch from upstream to resolve
    black screen bugs.
  - debian/rules:
    - Use xdt-autogen and dh-autoreconf.
    - Build with no-lock-on-suspend and late-locking support.