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Description
This PR proposes an API for a metadata class that supports axis-aligned metadata and hence slicing of that metadata via the standard Python slicing API. The Metadata class tracks the shape of the data array with which it's associated, enabling it to interpret how to apply a slice item valid for that array.
This API allows, but does not require, metadata to be associated with data axes. It allows metadata to be added, changed or removed, but stores of copy of the original. It also allows comments on metadata values to be stored.
Fixes #