Broadcast should handle transpose of StaticVector

[bshall]

If x is a SVector then broadcast(f, x', ...) should return a StaticArray. Currently the broadcasting falls back to Base except for broadcasts with a scalar. For example

x = SVector(1, 1)
1 .+ x'

returns a RowVector{T, SVector{2, T}}.

[andyferris]

The behavior in the OP is intended.

We can't have that all statically-sized arrays are <: StaticArray. The RowVector code in Base is designed to be compatible with packages like StaticArrays (to wrap RowVector on the outside). Trait-based dispatch would help to express static-sizeness better...

However, the problem is that not all operations work on RowVector{<:StaticArray}. e.g.

julia 0.6> x = SVector(2,3)
2-element SVector{2,Int64}:
 2
 3

julia 0.6> x' .+ x
2×2 Array{Int64,2}:
 4  5
 5  6

We should look into this.

[wsshin]

@bshall, this has been also resolved by #274. Could you close this issue as well?