#50 Overlaying geometries

* refactors geometry field into GeoReferencedMixin, holding more handy methods and used in all models, formerly holding the geometry field
* refactors backend admin configuration, so modified, deleted and created are not editable in the backend which also skips loading of all possible choices
* fixes typo in sanitize_db command
* introduces GeometryConflict model, holding a link between two geometries, where one overlaps the other
* adds first (WIP) messages into detail views of ema and intervention for test purposes

intervention/models/intervention.py

@@ -7,6 +7,7 @@ Created on: 15.11.21
 """
 import shutil
 
+from django.contrib import messages
 from django.contrib.auth.models import User
 from django.db import models, transaction
 from django.db.models import QuerySet
@@ -18,13 +19,15 @@ from intervention.models.legal import Legal
 from intervention.models.responsibility import Responsibility
 from intervention.models.revocation import RevocationDocument, Revocation
 from intervention.utils.quality import InterventionQualityChecker
-from konova.models import generate_document_file_upload_path, AbstractDocument, Geometry, BaseObject, ShareableObjectMixin, \
-    RecordableObjectMixin, CheckableObjectMixin
+from konova.models import generate_document_file_upload_path, AbstractDocument, BaseObject, \
+    ShareableObjectMixin, \
+    RecordableObjectMixin, CheckableObjectMixin, GeoReferencedMixin
 from konova.settings import LANIS_LINK_TEMPLATE, LANIS_ZOOM_LUT, DEFAULT_SRID_RLP
+from konova.utils.message_templates import DATA_UNSHARED_EXPLANATION
 from user.models import UserActionLogEntry
 
 
-class Intervention(BaseObject, ShareableObjectMixin, RecordableObjectMixin, CheckableObjectMixin):
+class Intervention(BaseObject, ShareableObjectMixin, RecordableObjectMixin, CheckableObjectMixin, GeoReferencedMixin):
     """
     Interventions are e.g. construction sites where nature used to be.
     """
@@ -42,7 +45,6 @@ class Intervention(BaseObject, ShareableObjectMixin, RecordableObjectMixin, Chec
         blank=True,
         help_text="Holds data on legal dates or law"
     )
-    geometry = models.ForeignKey(Geometry, null=True, blank=True, on_delete=models.SET_NULL)
 
     objects = InterventionManager()
 
@@ -263,6 +265,13 @@ class Intervention(BaseObject, ShareableObjectMixin, RecordableObjectMixin, Chec
         if self.checked:
             self.set_unchecked()
 
+    def set_status_messages(self, request: HttpRequest):
+        if not self.is_shared_with(request.user):
+            messages.info(request, DATA_UNSHARED_EXPLANATION)
+        request = self._set_overlapping_message(request)
+        request = self._set_overlapped_by_message(request)
+        return request
+
 
 class InterventionDocument(AbstractDocument):
     """