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Draft: change sort tag in DicomSeries.numpy

Ronan Lefol requested to merge numpy_sort into main

The current sort method for 2D slices to 3D volume sorts by real-world coordinates, this causes all CT scans to always show feet->head. However, certain CT scan instances are saved in the order head->feet (for whatever reason).

The current pre-sort method may lead to an oversight that such a thing is occurring in the data. Sorting by InstanceNumber instead presents the volume "as is".

Arguably, this should maybe allow the user to choose the tag to filter on? Unsure

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