Space/time optimization

[armcknight]

Spacial optimizations

Convert internal value array to most space-efficient representation:

• On lazily computing properties
• isSymmetric
• triangularComponent
• bandwidth/isDiagonal (when those are implemented)
• When creating a new matrix

Time optimizations

• When creating a matrix, compute all possible representations (triangular, symmetric, band, leading dimensions) for use by different algorithms or inspection @properties (e.g. immediate return of asking for the conventional column-major representation of a matrix created from row-major packed triangular representation)