[6.1][7.0][trunk][stock] Move destination and partial picking

When doing a partial picking, if the quantity received/sent is lesser than the expected one, then a new move with the set quantity is created and the move is set to done by workflow.

The corresponding code is:

if product_qty != 0:
    defaults = {
            'product_qty' : product_qty,
            'product_uos_qty': product_qty, #TODO: put correct uos_qty
            'picking_id' : new_picking,
            'state': 'assigned',
            'move_dest_id': false,
            'price_unit': move.price_unit,
            'product_uom': product_uoms[move.id]
    }

I think that the "move_dest_id" value should be kept from the original move for easier traceability.

if product_qty != 0:
    defaults = {
            'product_qty' : product_qty,
            'product_uos_qty': product_qty, #TODO: put correct uos_qty
            'picking_id' : new_picking,
            'state': 'assigned',
            'move_dest_id': move.move_dest_id.id,
            'price_unit': move.price_unit,
            'product_uom': product_uoms[move.id]
    }