Purpose
=======
eLearning users may want to easily reuse a course to create a new one.
The user might want keep the section structure,
only part of the content and change the rest,
create an exact copy except documents are in another language,
or reuse a course for a few attendees.
Specifications
=============
Write copy_data function to add "copy" at the end of the name and
copying all the course content when duplicating a course.
Task-2704325
closesodoo/odoo#80980
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>