[PATCH] Add mlmmj (Mlmmj — Mailing List Management Made Joyful)

[ng0]

In the absence of a functional environment this is assumed to work when one of 
us will create a service which populates /var/ etc accordingly OR if the bash 
scripts for list creation just work.
I would test it myself, but right now I can only testify that the build works. 
Setting it up on a server will be delayed until I have taken the time to 
assemble a GuixSD server with a static IP.

Read the README file to see why and where the default locations are.