JuliaData / DataTables.jl / 355

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Update vcat for consistency w/ Base.vcat and improve array promotion

This PR removes vcat support for arrays of datatables and makes the
Base.vcat style of vcat(args...) the only call option. Removes
assumptions for joining datatables with missing, unique, and out of
order columns. vcat'ing datatables with unmatched headers results in
error messages that explain how the columns are inconsistent. Uses
@nalimilan's @generated function to implement a new type of
AbstractArray promotion rule that improves handling of NullableArrays
and CategoricalArrays. Extends vcat testing.

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