2.1.1 - Fix for critical regression in 2.1.0

A change added near the end of development broke all compilation on 20-pin parts because something went wrong with my mass-add techniques for adding entries to boards.txt. This is utterly unmaintainable. I need to make a script to generate boards.txt entries - at least to get them to all have the same organization, you know?!

And I definitely need to get CI working too...