Relevation 1.3.1 released

A small update to Relevation, to ease usage on contemporary systems it's now running on Python 3. Hopefully I didn't break it since I'm not used to Python 3.

No other big changes, just some internal ones.

Relevation 1.3.1
or (zip includes PDF and HTML manpage)

Debian users can use my apt repository located at Instructions are provided there.