Removing obsolete flag '--no-backups' from po4a options.
Adding '--package-version' to po4a options.
Adding .po integrity check target to manpages/Makefile.
Adding plymouth support for LUKS passwort prompt based on a patch from Gaudenz Steinlin <gaudenz@debian.org> (Closes: #754166).
Releasing debian version 4.0.0-1.

Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>
Merge remote-tracking branch 'live-systems/debian-next' into debian