Rename DisjointSets to DisjointSet ?

[oxinabox]

The fact that DisjointSets is a collection of sets under the hood is not relevent to the user.
The API is that of a AbstractSet.
The implementation is a implementation detail that is actually completely invisible to the user AFAICT

[oxinabox]

@c-p-murphy did you ever make a PR to do this?
I can't find it

[c-p-murphy]

Hey @oxinabox—no, sorry, things got hectic this past semester with everything going on in the world and I lost track of it. I'll try to finish putting something together over the next week or so and then submit a PR. Thanks for the reminder.

[oxinabox]

Cool I might hold off releasing 0.18 for this so can get the deprecations in.
cf #577

[oxinabox]

@c-p-murphy any update? I wouls still like to get this in before tagging 0.18

[laborg]

Already fixed by #700