[IMP] account_analytic_analysis : Add recurring field to product and add...

... product to contract if it is recurring product on creation of sale order

- Task: https://www.odoo.com/web#id=9315&view_type=form&model=project.task&menu_id=3942&action=327
- Pad: https://pad.odoo.com/p/r.mDSbrxm5I4kNe8W7
As you use the new API, you may use simpler variable names: a product is a product; use product instead of product_obj. account_analytic_account_obj could be renamed to analytic_account. Allow to lessen the size of lines.