Disjoint sets

Dear boost::disjoint_sets: I hate you. Or not.

I do like you, I have to say, and also dislike you. You would be more useful if your documentation was a bit more clear, or if every example out there was not a copy of one of the two examples found in StackOverflow.

Well, a little less conversation and a little more action. If I manage to understand enough, I will add some example here.