Hard reshape

[AntonOresten]

There should be a hard, copying, reshape that copies to avoid double wrappers. See #4.

Basically:

julia> reshape(transpose(rand(2,3)), :) |> typeof
Base.ReshapedArray{Float64, 1, LinearAlgebra.Transpose{Float64, Matrix{Float64}}, Tuple{Base.MultiplicativeInverses.SignedMultiplicativeInverse{Int64}}}

julia> reshape(copy(transpose(rand(2,3))), :) |> typeof
Vector{Float64} (alias for Array{Float64, 1})

It should be used on arrays going in as well, in case they're already wrapped, such that we don't end up with a quadruple wrapper.