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This adds support for non-scalar entry properties such as size.

This fixes dangling line series crashing when the model they still listen
to resets.

This happens for example when deleting the current product.

This propagates schema changes to the other views correctly.

This fixes losing the selection on product updates.

This is now superseded by more fine-grained control about data and
aggregation types.

Allows merging of multiple data sets, and matches what we actually get
from data export.