To use this module:

* Go to Sales
* Create or select a quotation
* Set the agreement template and add some products
* Confirm the quotation. An agreement is created and linked to the sales order:

  * the agreement template is copied into an agreement with a copy of the
    sections, clauses, recitals and appendices
  * all the sales order lines are added as agreement lines
  * the service products (with is_serviceprofile = True) on the SO are added as service profile on the agreement
  * the customer information is set from the sales order
  * the eventual analytic account linked to the sales order is set on the agreement
  * the agreement is linked to the sales order and vice versa
