* Backport from 10.0 to 9.0: import odoo to import openerp, <odoo> to <openerp>, bring back <data> if noupdate=1, rename __manifest__.py to __openerp__.py, downgrade version number to 9.0.1.0.0, and make module installable.
* Re-add H.S.codes menu item under Sales-Product-Configuration.
(it had been removed to remove the reference to product module, but I don't understand that decision since this module by nature depends on product module anyway)
* Added module tests.
* flake8
* Encoding lines at the beginning of python files