Mambo jambo

My PhD Thesis is written, I have now time to work a bit on atlas.

Many of you have noticed unbearable long downloading times for installing packages E.g. #390
With the update of snakemake to >6.1 mamba is used instead of conda. This makes installing packages faster and more robust.

Even though this implied big changes in the back end, the API, and dependency graph doesn't change. This means You can continue your previous project with the updated version of atlas, at least this should be possible.

I never less marked this version as alpha because I had a breaking change in the HTML reports. I don't think fixing this is now a priority as almost all the stats can be looked at as tables. Once, I have fixed this you will be able to rerun the reports without impact on the other results.