Use views instead of owned arrays where possible

[BTOdell]

Many of the functions in this library require owned arrays to be passed: https://github.com/Smirkey/powerboxes/blob/main/powerboxesrs/src/nms.rs#L32

The algorithm eventually makes a copy of the data anyway, so it would be more efficient to only require views to be passed as input.

[Smirkey]

Some very good advice thanks :)
I will look into it

[BTOdell]

I applied these recommendations (along with some others) to my own fork: #52

Note that these are breaking changes.

[Smirkey]

great thanks !!

[Smirkey]

solved by #53