#31 API Tests

* adds creation tests with minimum data for intervention, compensation, ema and ecoaccount
* fixes bug where empty geometry would not be created properly using the API
* reworks key fetching from POST data, so inproperly stated keys will lead to an error for the API user, instead of silently working and use default data
* adds some logical checks for deductable_surface of eco account creation using api
* fixes bug that would have occured on creating compensations via api

api/tests/v1/create/intervention_create_post_body.json

@@ -0,0 +1,21 @@
+{
+    "type": "MultiPolygon",
+    "coordinates": [
+    ],
+    "properties": {
+        "title": "Test_intervention",
+        "responsible": {
+            "registration_office": null,
+            "registration_file_number": null,
+            "conservation_office": null,
+            "conservation_file_number": null,
+            "handler": null
+        },
+        "legal": {
+            "registration_date": null,
+            "binding_date": null,
+            "process_type": null,
+            "laws": []
+        }
+    }
+}