Security updates for Thursday

Security updates have been issued by Arch Linux (ghostscript), Debian (firefox-esr, libgd2, libvncserver, php-pear, rssh, and spice), Fedora (docker, docker-latest, firefox, moodle, and wireshark), Mageia (bluez, ghostscript, php-tcpdf, phpmyadmin, virtualbox, and zeromq), openSUSE (ghostscript), Red Hat (firefox), Scientific Linux (firefox), Slackware (kernel), and Ubuntu (avahi, firefox, and openjdk-8, openjdk-lts).