Dependency on DataStructures should be explicit and versioned

[davidanthoff]

DataFrames.jl/src/abstractdataframe/sort.jl

Lines 17 to 18 in 453b446

	import SortingAlgorithms.DataStructures.FasterForward,
	SortingAlgorithms.DataStructures.FasterReverse

takes a dependency on DataStructures without declaring that in the Project.toml, and in particular without putting in proper version bounds.

I believe FasterForward was only added in v0.18.0 to DataStructures, so that line of code errors when combined with any older version of DataStructures. I think the immediate fix is very simple: add DataStructures to Project.toml, remove this indirection of importing via SortingAlgorithms and put a DataStructures = 0.18 into the compat section.

The more complicated issue is that we now have a version in the general registry that looks to the package manager as working with DataStructures <v0.18, whereas it does. I think ideally that version would either be yanked, or maybe one can somehow modify the compat bounds in the registry for the existing tagged version?

[bkamins]

Fixed in #3359 (hopefully cleanly)