[MIG] sql_request_abstract from 15.0 to 16.0

- Add new main entry menu for SQL configuration
- Add abstract tree view
- Add abstract form view
- ADD ace/mode-pgsql.js file to have syntaxic coloration in sql field
- move has_grouped_changed from bi_sql_editor to sql_request_abstract
- remove main menu entries, replaced by new spreadsheet menu entries in V16
- update translation
- IMP : inherit from mail.thread to use chatter
- ADD : new note fields
- REF : add comment on has_grouped_changed field

sql_request_abstract/readme/USAGE.rst

@@ -1,5 +1,7 @@
 Inherit the model:
 
+.. code-block:: python
+
     from odoo import models
 
     class MyModel(models.model)
@@ -9,3 +11,6 @@ Inherit the model:
         _sql_request_groups_relation = 'my_model_groups_rel'
 
         _sql_request_users_relation = 'my_model_users_rel'
+
+
+See implementations in the modules ``bi_sql_editor`` and ``sql_export``. (same OCA/reporting-engine repository)