Support non-ndarray computations, cache unit calls, and add slots to DataArray#47

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stubbiali wants to merge 6 commits intomcgibbon:masterfrom

stubbiali:ubbiali

Commits on Oct 28, 2019

Transpose fields only when really needed.
stubbiali
committed

Commits on Dec 17, 2019

Added __slots__ to DataArray class.
stubbiali
committed

Commits on May 1, 2020

Commits on Oct 15, 2020

Avoid relying on unit_registry to check if units are the same.
stubbiali
committed

Commits on Jan 12, 2021

Cache calls to UnitRegistry.
stubbiali
committed