[FIX] point_of_sale: the product name field changed to display_name to include variants information, this should be reflected in searches as well.
[FIX] point_of_sale: the order uid were generated via timestamp, which were not sequencial or easy to understand, they are now generated with the order id and order sequence number which are sequencial
[FIX] point_of_sale: invoicing in the pos printed the wrong order due to a mismatch between order ids and invoice ids
[IMP] models: improve code of _convert_to_write(), make it easier to read
[FIX] product, point_of_sale: add a display_default_code context option that can remove the internal reference (default code) from the displayed product name. Used in the point of sale to unclutter the receipt & GUI
[FIX] mrp_operations: use list instead of record set for o2m

In v7, accessing a o2m returned a list of browse record while it returns a recordset in v8.
The method _move_pass expects a list so a manual conversion is required.
Fixes #1787
[FIX] website_forum_doc: fixed tree view impossible to use to create new chapters (missing forum_id due to wrongly copy-pasted views) + fixed max width of images displayed in the doc.