Introduce ++ as the concatenation operator

For better or worse PlusPlus is now registered, it’s basically Cameron’s package at this point :slight_smile:

julia> using Pkg; Pkg.add("PlusPlus");
julia> using PlusPlus
julia> [1,2,3] ++ [4,5]
5-element Array{Int64,1}:
 1
 2
 3
 4
 5
julia> [1,2] ++ 3 ++ 2
4-element Array{Int64,1}:
 1
 2
 3
 2

etc, works with anything that can be v-cat including DataFrames.

For strings:

julia> "ab" ++ "cde"
"abcde"

julia> 'a' ++ "bc" ++ 'd'
"abcd"
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