[FIX] delivery: use unit of measure and not unit of stock to compute price of delivery

The computation expects uom and it was wrongly passing uos qunatities.
[FIX] stock: allow same serial number for different products

Bug lp:1222289, opw 597639
[FIX] web: correct rev 680f955

Missing backport of commit f652402 for buffered dataset
Again, should not be forwardported
[FIX] mail: display translated model name at record creation

When a record is created, if it inherits from mail.thread, a message 'OBJECT created' is posted. 'created' is translated but the name of the model wasn't.
This fix uses the name of the linked ir.model which is already a translatable field.
lp:1262000, opw 611043
[MERGE] forward port of branch 7.0 up to 67cca3f