Fix sale_id on stock.picking.out view

View inheritance is on the wrong model after model change of stock.picking.
Here we just fix the model.
Merge pull request #650 from yvaucher/patch-1

[7.0] sale_stock: field sale_id should be on stock.picking.out view
[FIX] web: format.js, toString while parsing date

When attempting to parse client date, value is not always a string.
We force the toString when adding the leading 0, as the replace method is for string