major refactor

- add request status to search instance API
- use JSend-type response in elixForms clients
- readjust namespaces
- add more unit tests (manual HTTP requests too)

tests/Manual/api-authorization.http

@@ -0,0 +1,17 @@
+# Sample requests to try out authorization logic
+
+###
+# Authorization OK
+
+@term=MA
+
+GET http://localhost:8000/api/dipendenti/cerca?term={{term}}
+Authorization: Basic elixforms_ws:password123
+X-API-Key: myApiAccessToken
+
+###
+# Should return 401 Unauthorized
+
+@term=MA
+
+GET http://localhost:8000/api/dipendenti/cerca?term={{term}}