stock: Keep product_uom for stock_warehouse_orderpoints
stock: Fix v7 -> v8 dataloss regression

https://github.com/odoo/odoo/pull/1258
https://github.com/odoo/odoo/pull/2178
odoo-8.0 commit 30a64c
stock: Migrate orderpoint qty information when product_uom != move uom
Merge pull request #7 from plaes/onestein

stock: Fix stock_warehouse_orderpoint quantities