Disable simple_dsl by default (and document that it exists)

README.md

@@ -247,6 +247,8 @@ Using optional apps
 Some apps are not enabled by default :
 
 - *vpn*: Management of OpenVPN subscription and credentials through LDAP
+- *simple_dsl*: Simple DSL subscriptions, without handling
+   any authentication backend or user configuration ("marque blanche")
 
 You can enable them using the `EXTRA_INSTALLED_APPS` setting.
 E.g. in `settings_local.py`:

coin/settings.py

@@ -163,7 +163,6 @@ INSTALLED_APPS = (
     'coin.reverse_dns',
     'coin.configuration',
     'coin.isp_database',
-    'simple_dsl'
 )
 
 EXTRA_INSTALLED_APPS = tuple()