To keep compat with ould old Django 1.11

Assorti d'un message personalisé.

To pave the way for more email sending :-)

Fix #56

Require using a setting to define the URL.

(quick'n'dirty)

Thanks @daimrod :-)

So that we do not keep data forever…

Send reminders to authors, meant to be called by cron-like.

ref #27

Usefull for cases where there is no request available to build a full URL (eg:
something called from cron).

Since Django 1.11 migration

That was broken by Django 1.11 upgrade

Bug was introduced in 9b6c7dcc

Seems almost incredible but no code update was needed. Lucky us !

… Or careless me, we will see ;-).

As a matter of consistency with other parts of the interface

Containing the secret contrib management link

fix #45

Protected by signed token

iso-functional commit