[IMP] add some extra style css support and add a debugger mode. Update readme

mail_usability/README.rst

@@ -8,3 +8,13 @@ Take back the control on your email
 - add the option 'All Messages Except Notifications' on partner and use it by default to avoid sending unwanted mail to partner
 - better email preview, allow to select between the whole database object and not only the last 10
 - use a light template version for notification without link (link should be explicit)
+- add some additional style in the white list when santizing html field (see tools.py)
+- make the email template by default not 'auto_delete'
+
+## TIPS
+
+Never, never tick the 'auto_delete' on mail template because it fucking hard to debug
+and understand what have been sent (we should create a module with a crontask, that drop them latter)
+
+If the template of mail do not look like the same when saving it in odoo, maybe the sanitize style have drop some balise
+please run odoo with "LOG_STYLE_SANITIZE=True odoo" to understand what have been drop, magic warning logger will tell you everthing