total quantity and price calculate all lines, in a manufacturing order with 680 lines,
it takes ~50 seconds to open it

erp5_base&erp5_property_sheets: add forward week field to define how many weeks's stock we need to check

This reverts commit 34d26a74.

from DateTime import DateTime
from erp5.component.module.DateUtils import addToDate

return addToDate(DateTime('2019/02/25'), second=6048000)

2019/02/28