Robert Lemmen made an official Debian GNU/Linux package of Tablix 0.3.0. His package is currently available from the Debian package repository.

This means that you no longer need to edit /etc/apt/sources.list on your Debian Unstable system in order to install Tablix with apt-get. However because there are some non-trivial differences between Robert's packages and my packages, I will continue to update my repository at tablix.org.