Improve compliance with a Metrc-compliant POS for Maryland that tracks product quantities via the POS

https://research-wiki.win/index.php/Metrc-Compliant_POS_for_Maryland:_How_to_Prevent_Compliance_Drift

Improve compliance with a Metrc-compliant POS for Maryland that tracks product portions by the POS and keeps METRC inventory aligned with each and every transaction.