Document new Dask behaviour and unpin its dependency from environment.yml

[pgbarletta]

Originally opened as a bug on the mdanalysis repo: #3931.

I'll fix this after PR #241 is merged. Since this new behaviour forced me to pin Dask to an older version, I'll also unpit it once the notebook is fixed.

[orbeckst]

Thanks @pgbarletta .

Because you said that you'd address the issue I assigned it, but in principle you should also be able to do so yourself. It's always good to see if someone has committed to taking charge of something.

[jandom]

@pgbarletta are you still interested in pushing forward this ticket? If it's not a priority any more, do you mind if we close out?

[pgbarletta]

@pgbarletta are you still interested in pushing forward this ticket?

Yes. I have time to contribute again and I'm now going 1 issue at the time. This particular issue still needs to be addressed and I have to ask some questions to the coredevs before solving this.