[FIX]purchase/stock: when validating a PO, information on scheduled_date was not correct, should take
into account, schedule_date for each product instead of PO date.
Also add a message in chatter whenever we receive a product. Added a function in tools/misc/py for the
purpose of printing correct date in user timezone + timezone information.
[FIX]stock: add method that was added in server here to prevent user to have to update base do not forward in trunk
[FIX]stock: remove message from chatter, useless since information appears with tracking state and change view
so that schedule date appears when product hasn't been received and date of reception appears when it has
been received
[FIX] purchase: fix the scheduled date on the created stock move + stock: usability fixes/imp