1. new package 'message'2. Rename the 'Grid' classes to match
move data types, like FlatND and InterpolatorND, to a separate package.
Add License
Save PNG effect almost finished. Supporting App (hopefully!) completely finished.
What remains to be done: put actual saving of the Bitmap in a separate thread, away from the Graphics thread!!
Progress with Save app.
Beginnings of support for the 'Save' app.