Merge tag 'upstream/8.4.0+dfsg_rc1' into master-8.4

Upstream version 8.4.0+dfsg~rc1

# gpg: Signature made Thursday 14 January 2016 06:38:03 PM IST using RSA key ID 4512C22A
# gpg: Good signature from "Praveen Arimbrathodiyil (piratepin) <praveen@debian.org>"
# gpg:                 aka "Pirate Praveen (pirates.org.in) <praveen@onenetbeyond.org>"
# gpg:                 aka "Pirate Praveen (piratesin) <me@j4v4m4n.in>"
# gpg:                 aka "Pirate Praveen (PP) <praveen@privacyrequired.com>"
# gpg:                 aka "Praveen Arimbrathodiyil (j4v4m4n) <pravi.a@gmail.com>"