DIP80: phobos additions

[Ilya Yaroshenko via Digitalmars-d]

> I believe that Phobos must support some common methods of 
> linear algebra and general mathematics. I have no desire to 
> join D with Fortran libraries :)

D definitely needs BLAS API support for matrix multiplication. 
Best BLAS libraries are written in assembler like openBLAS. 
Otherwise D will have last position in corresponding math 
benchmarks.