* Merge with Debian unstable (LP: #609620). Remaining changes: + debian/patches/71_exiq_grep_error_on_messages_without_size.dpatch: Improve handling of broken messages when "exim4 -bp" (mailq) reports lines without size info. + Don't declare a Provides: default-mta; in Ubuntu, we want postfix to be the default. + debian/control: Change build dependencies to MySQL 5.1. + debian/{control,rules}: add and enable hardened build for PIE (Closes: #542726).