Add combined 3D model and simple npred function #1040
What I have so far is moved the following things from the example script into Gammapy:
What I still plan to do in this pull request:
The next steps are then this, which I'll leave to future PRs:
If anyone is interested in helping to implement something in this direction, please let me know.
@adonath - If you have time to review, please do. (I'll probably merge soon and start with follow-up PRs, but comments are welcome any time and then taken into account there).
I didn't get as far as I wanted today, but I'm still merging this now.
There was a bug in