ch-ch-update: series, closed-form series, and strides

[Don]

Andrei Alexandrescu wrote:
> Jagged, banded, diagonal, fixed-size, and sparse layouts come naturally 
> and will be hopefully supported in a mixable-and-matchable form (e.g. I 
> want a block matrix of 3x3 matrices). I want to focus on storage for 
> now, put it in the standard library, to then allow great scientific 
> programmers like you guys to use those storages as a common data format 
> on top of which cool algorithms can be implemented.

This sounds like the perfect approach. Everything's built around the 
storage format.