Display delay for stock move and shipment

Merged Cédric Krier requested to merge topic/default/stock-delay into branch/default

As moves and shipments are replenished by cron task, we loose the original planned date and so we do not know how much late an operation is.
The proposal is to store the original planned date (from the sale and purchase) and compute the delay with the new planned date or the effective date.
This will provide a visual hint about delay but also it can be used as trigger for notification.

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