[ADD] product_customer_code_picking module v.7.0

Moving the MP: https://code.launchpad.net/~agilebg/stock-logistic-flows/adding_product_customer_code_picking/+merge/202472
Agree. Also see my comment at https://code.launchpad.net/~agilebg/stock-logistic-flows/adding_product_customer_code_picking/+merge/202472/comments/537661

I'm about to apply some fix to this PR