* Merge from debian unstable, remaining changes:
  - build without "-Wl,--as-needed" to avoid crash on theme switching
* debian/patches/01_ubuntu_theme.patch:
  - add ubuntu theme
* debian/patches/02_make_ubuntu_theme_default.patch:
  - default to the ubuntu theme
* debian/patches/09_change_themes_crash_rev1.patch:
  - fix crash on theme switching
* debian/patches/08_hide_properties_desktop.patch:
  - do not show notification-properties in the menu