[IMP] product: search on internal reference

When searching on the name of a product.template, search also on the default_code. Move the filter from product.product to product.template.
The field default_code is on the product.product but accessible through a related field, meaning when reading it will fetch only the first variant but searching on all variants.
Fixes #3399
[IMP] stock: display chained moves

Add field move_dest_id in stock.move form view for better debugging of complexe stock flows.
[ADD] added website countdown snippet