The 'import' attrs is valid according to the rng definition of the
list view. It is used in a few views in Odoo. However, it didn't
actually work (in most cases, it worked by chance because it is
set to "0" in addition to create="0", and create="0" already
disables the import feature).
With this ref, the 'import' attrs is taken into account and we
can now disable the import feature even if the create one is
enabled. Moreover, it is now documented.
Aaron Bohy
55676110c8