Fixed bug in sorting on array interface

[philippjfr]

It appears that sorting on the ArrayInterface was broken in certain cases, this creates a recarray view to perform the sorting on, which should work more robustly. I'll add a couple of tests before this is ready to merge.

[philippjfr]

Ready to review. Note that the grid interfaces don't support sorting in general and neither does dask, hence the "Not supported" unit tests.

[jlstevens]

Using a record array like that seems a bit like a big hammer but I can see why it might be more reliable. Anyway, looks good and the tests are passing. Merging.

[philippjfr]

Using a record array like that seems a bit like a big hammer but I can see why it might be more reliable.

Since it's just a view it should be fairly lightweight, and looking back at it I think it was using a record array without explicit naming before anyway. Seems to be the only way to sort by column.

[jlstevens]

For lexical sort? Right, I've used record arrays for that before...

[philippjfr]

For lexical sort? Right, I've used record arrays for that before...

Right.

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