The purpose of this is to help stock manager in their quants analysis.
An overview of quants can be accessed via inventory menu and for specific
lot/SN via the locate button.
This commit add quants in every location (only internal location previously)
The purpose is to introduce a double entry for quant (add quants to a destination
location will always remove quant from a source location).
Quants in customers/suppliers location are shared between all customers/suppliers.
In order to know the amount of product that come from a specific customer/supplier
the tracability report should be used.
Simon Lejeune
e1cea2640f