* Merge from debian unstable. Remaining changes: (LP: #697934) - debian/patches/71_exiq_grep_error_on_messages_without_size.patch: + Improve handling of broken messages when "exim4 -bp" (mailq) reports lines without size info. - debian/control: Don't declare a Provides: default-mta; in Ubuntu, we want postfix to be the default. - debian/{control,rules}: Add and enable hardened build for PIE. (Closes: #542726) * Drop B-D on libmysqlclient15-dev, resolved in Debian.