[wlug] Debian Is Moving To MariaDB

I upgraded my main machine, running Debian Unstable, a few days ago, and my time and billing system stopped working. Further investigation revealed that the mysql-server package had somehow disappeared. I am installing it again now, and it looks like it is putting in MariaDB instead of Oracle MySQL. The executables etc still keep the “mysql” name, so it looks like nothing in my code need change...