Move diagnostics, statistics and maintenance functions from the main app into separate apps

apps/diagnostics/api.py

@@ -0,0 +1,11 @@
+from common.utils import reverse_lazy
+
+diagnostics = {}
+
+
+def register_diagnostic(namespace, title, link):
+    namespace_dict = diagnostics.get(namespace, {'title': None, 'links': []})
+    namespace_dict['title'] = title
+    link.url = getattr(link, 'url', reverse_lazy(link.view))
+    namespace_dict['links'].append(link)
+    diagnostics[namespace] = namespace_dict