Finished conversion of Mayan to the new document grouping app and paradigm

apps/grouping/admin.py

@@ -0,0 +1,16 @@
+from django.contrib import admin
+
+from grouping.models import DocumentGroup, DocumentGroupItem
+
+
+class DocumentGroupItemInline(admin.StackedInline):
+    model = DocumentGroupItem
+    extra = 1
+    classes = ('collapse-open',)
+    allow_add = True
+
+
+class DocumentGroupAdmin(admin.ModelAdmin):
+    inlines = [DocumentGroupItemInline]
+    
+admin.site.register(DocumentGroup, DocumentGroupAdmin)