[IMP] document_page_approval: Several improvements (#169)

* 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
* Update version number
* 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.

document_page_approval/__manifest__.py

@@ -4,7 +4,7 @@
 
 {
     'name': 'Document Page Approval',
-    'version': '10.0.2.0.0',
+    'version': '10.0.2.1.0',
     "author": "Savoir-faire Linux, Odoo Community Association (OCA)",
     "website": "http://www.savoirfairelinux.com",
     "license": "AGPL-3",
@@ -15,7 +15,6 @@
     ],
     'data': [
         'data/email_template.xml',
-        'workflows/document_page_approval.xml',
         'views/document_page_approval.xml',
         'security/document_page_security.xml',
         'security/ir.model.access.csv',