TODO

Insert the GPL stuff in the source files.
Create a filter that rejects all messages that match a series of regular expressions.
Maybe switch from storing the daily journal in a file, to storing it in a database.
Write the systemd service that starts pyruse on boot.
Write the systemd service+timer that restores bans after a reboot.
Maybe switch from Step.run() recursion to Step.run()-in-a-loop to avoid too-deep call stacks.
Eventually make the code more elegant, as I learn more about Python…