Moar Methods.

[shabbychef]

Always need more methods:

• [x] sum
• [x] prod
• [ ] svd?
• [x] eigen
• [ ] dimensionality reduction?
• [ ] Kronecker sum?
• [ ] expm
• [ ] logm
• [ ] %o% ?
• [x] max, min
• [ ] pmax, pmin

[shabbychef]

Though arguably max and min should be using pmax and pmin.