Don't use memmap for loading the images.
Minor changes to from where we load the files
Mockup of OmmatiDiag with OpenSCAD

I've made a crude drawing with
[Tinkrecad](https://tinkercad.com/things/3utMiKsZhx9), but this has
proven to be too inflexible. Thus starting a drawing (or more
programming) with [OpenSCAD](http://www.openscad.org/).
Ignoring some more