reactivate module sale_exception_nostock
port model and method to api 8.0
make_to_stock is now on order line
define location from lines
rename of exceptions_ids to exception_id in tests
replace product_qty by product_uom_qty
check if procure_method is 'make_to_stock'
fix yaml tests
fix use of @api.one

`@api.one` will concatenate the return value of the function in a list for all
records in the browse_record, which requires getting elements from that list
afterwards.

In case the method is meant to be call on an individual record, it is better to
use `@api.multi` and a call to ensure_one to make sure there is a
single id in `ids`.
Merge pull request #37 from yvaucher/8.0-sale_exception_nostock

8.0 port sale_exception_nostock