Add hcat and vcat#184

Open

AStupidBear wants to merge 2 commits intoJuliaArrays:masterfrom

AStupidBear:cat

Commits on Jun 10, 2020

add hcat and vcat
AStupidBear
committed

Commits on Jun 15, 2020

fix type instability of _cat
AStupidBear
committed