More specific definition for DenseArray

[Tamas_Papp]

@emmt

DenseArray can be used to write a method which calls a numerical library (like BLAS or LAPACK but not only) in such a way that it remains applicable to other types than just Array

This is a very valid use case, which I believe is served currently by StridedArray. Also see strides.

Again, I don’t think there is any reason for a user (ie someone writing code outside Base) to even know about DenseArray. AFAIK it is a remnant for an earlier API.