[Issue 6718] "nWayUnion" => "nWayMerge", plus true nWayUnion

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=6718

--- Comment #11 from Andrei Alexandrescu <andrei at erdani.com> ---
>Maybe we should also rename setIntersection to multiwayIntersection

setIntersection has two inputs. "multiwayIntersection" would have multiple
inputs (a range of ranges) and would be a distinct function with important uses
and its own theory and practice (http://www.cs.toronto.edu/~tl/papers/wea06.pdf
is a good overview).

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