Add django-debug-toolbar to the project

This is always enabled but debug toolbar is a no-op if settings.DEBUG=False,
which must anyway be the case in production.

README.md

@@ -349,6 +349,8 @@ List of available settings in your `settings_local.py` file.
 - `HANDLE_BALANCE`: Allows to handle money balances for members (False default)
 - `INVOICES_INCLUDE_CONFIG_COMMENTS`: Add comment related to a subscription configuration when generating invoices
 - `MEMBER_CAN_EDIT_VPN_CONF`: Allow members to edit some part of their vpn configuration
+- `DEBUG` : Enable debug for development **do not use in production** : display
+   stracktraces and enable [django-debug-toolbar](https://django-debug-toolbar.readthedocs.io).
 
 Accounting logs
 ---------------

coin/settings_base.py

@@ -118,6 +118,7 @@ TEMPLATE_LOADERS = (
 )
 
 MIDDLEWARE_CLASSES = (
+    'debug_toolbar.middleware.DebugToolbarMiddleware',
     'django.middleware.common.CommonMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
@@ -127,6 +128,14 @@ MIDDLEWARE_CLASSES = (
     # 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 )
 
+# Do not load jQuery from crappy CDN
+DEBUG_TOOLBAR_CONFIG = {
+    'JQUERY_URL': '/static/js/vendor/jquery.js'
+}
+
+# Used for debug toolbar
+INTERNAL_IPS = ['127.0.0.1', '::1']
+
 ROOT_URLCONF = 'coin.urls'
 
 # Python dotted path to the WSGI application used by Django's runserver.
@@ -140,6 +149,7 @@ TEMPLATE_DIRS = (
 EXTRA_TEMPLATE_DIRS = tuple()
 
 INSTALLED_APPS = (
+    'debug_toolbar',  # always installed, but enabled only if DEBUG=True
     'django.contrib.auth',
     'django.contrib.contenttypes',
     'django.contrib.sessions',

coin/urls.py

@@ -53,3 +53,10 @@ urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)
 
 # Pluggable apps URLs
 urlpatterns += list(apps_urlpatterns())
+
+
+if settings.DEBUG:
+    import debug_toolbar
+    urlpatterns = [
+        url(r'^__debug__/', include(debug_toolbar.urls)),
+    ] + urlpatterns

requirements.txt

@@ -19,3 +19,4 @@ freezegun==0.3.8
 django-registration==2.2
 pytz>=2018.5
 unidecode>=1.0,<1.1
+django-debug-toolbar>=1.9.1,<1.10