Upgrade to Django 1.11

- Deprecation warnings using Django 1.8 are resolved.
- Deprecation warnings using Django 1.11 are resolved.

- Admin: grappelli is no longer used.
- Upgrade to django-autocomplete-light v3 (v2 is not 1.11 compatible).
  * autocomplete.modelform_factory being dropped, code uses dal Select2
    views and widgets.

bda/admin.py

@@ -1,6 +1,5 @@
 # -*- coding: utf-8 -*-
 
-import autocomplete_light
 from datetime import timedelta
 from custommail.shortcuts import send_mass_custom_mail
 
@@ -9,6 +8,9 @@ from django.db.models import Sum, Count
 from django.template.defaultfilters import pluralize
 from django.utils import timezone
 from django import forms
+
+from dal.autocomplete import ModelSelect2
+
 from bda.models import Spectacle, Salle, Participant, ChoixSpectacle,\
     Attribution, Tirage, Quote, CategorieSpectacle, SpectacleRevente
 
@@ -24,8 +26,17 @@ class ReadOnlyMixin(object):
             return readonly_fields + self.readonly_fields_update
 
 
+class ChoixSpectacleAdminForm(forms.ModelForm):
+    class Meta:
+        widgets = {
+            'participant': ModelSelect2(url='bda-participant-autocomplete'),
+            'spectacle': ModelSelect2(url='bda-spectacle-autocomplete'),
+        }
+
+
 class ChoixSpectacleInline(admin.TabularInline):
     model = ChoixSpectacle
+    form = ChoixSpectacleAdminForm
     sortable_field_name = "priority"
 
 
@@ -180,7 +191,7 @@ class AttributionAdmin(ReadOnlyMixin, admin.ModelAdmin):
 
 
 class ChoixSpectacleAdmin(admin.ModelAdmin):
-    form = autocomplete_light.modelform_factory(ChoixSpectacle, exclude=[])
+    form = ChoixSpectacleAdminForm
 
     def tirage(self, obj):
         return obj.participant.tirage