[IMP] mail: add moderation on channels

Purpose of this commit is to allow moderation on incoming messages in
discussion channels. On some channels on which moderation is required
messages should be in a pending moderation stage. Moderators can accept
or refuse messages as well as always allow or ban messages coming from
a given set of emails.

Channels now have an option to be moderated. Moderators can be added on
channels. They have access to a specific UI in Discuss to see and take
action on messages waiting for moderation.

Concerning mail.thread message that are pending moderation are not notified.
It means nobody receives a notification about them. Moderation process calls
the notification once the message is validated.

Various features included in this commit :

 * a model is added to store the decision about emails, allow or ban;
 * access rights are updated so that only moderators can modify moderation
   fields on message;
 * specific bus notifications are send to moderated people as well as to
   moderators on incoming emails as well as when a decision is taken;
 * options are added on channels to send explanations to moderated emails;
 * options are added on channels to write and send guidelines explaining
   why and how moderation is performed;
 * a reminder is send daily to moderators with remaining messages to moderate;
 * discuss UI is adapted and a new channel is added below Inbox and Starred
   giving access to moderation tools;
 * chanenl UI is adapted allowing to moderate directly inside channels;

This commit is linked to task ID 29521. Closes #21921.

1 files changed, 2 insertions, 0 deletions

diff --git a/addons/mail/views/mail_message_views.xml b/addons/mail/views/mail_message_views.xml
index 5e2fb5514a2..09bb34c86ac 100644
--- a/addons/mail/views/mail_message_views.xml
+++ b/addons/mail/views/mail_message_views.xml
@@ -32,6 +32,7 @@
                                 <field name="email_from"/>
                                 <field name="author_id"/>
                                 <field name="record_name"/>
+                                <field name="moderator_id"/>
                             </group>
                             <group>
                                 <field name="parent_id"/>
@@ -39,6 +40,7 @@
                                 <field name="res_id"/>
                                 <field name="message_type"/>
                                 <field name="subtype_id"/>
+                                <field name="moderation_status"/>
                             </group>
                         </group>
                         <notebook>