[FIX+IMP] document_page_approval:

* Rename classes and files to match model names, and removed workflow engine.
* Some fields should be readonly if not in draft.
* Allow Knowledge / Manager to edit previous history names and summary
* Improve ux by adding user_has_drafts to document pages.
* Changes because of implementation of active field on document_page
* Add ir.rules for document.page.history
* Allow to quickly cancel&draft from 'to approve' state
* FIX BUG: am_i_approver was being run as sudo(), hence always giving the user Approving rights.
* FIX hooks
  Because of default='draft' on the state field, state IS NULL wasn't selecting anything.
  Left the condition in case this is changed in the future.

document_page_approval/hooks.py

@@ -1,20 +1,24 @@
 # Copyright 2018 Ivan Todorovich (<ivan.todorovich@gmail.com>)
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+import logging
+_logger = logging.getLogger(__name__)
 
 
 def post_init_hook(cr, registry):  # pragma: no cover
     # Set all pre-existing pages history to approved
+    _logger.info('Setting history to approved.')
     cr.execute("""
         UPDATE document_page_history
         SET state='approved',
             approved_uid=create_uid,
             approved_date=create_date
-        WHERE state IS NULL
+        WHERE state IS NULL OR state = 'draft'
     """)
 
 
 def uninstall_hook(cr, registry):  # pragma: no cover
     # Remove unapproved pages
+    _logger.info('Deleting unapproved Change Requests.')
     cr.execute(
         "DELETE FROM document_page_history "
         "WHERE state != 'approved'"