202 Geometry conflict checking to background

* wraps check_for_conflicts() in celery based method
* fixes bug on InterventionEditForm where geometry's save() has been called twice

konova/models/geometry.py

@@ -14,6 +14,7 @@ from django.utils import timezone
 
 from konova.models import BaseResource, UuidModel
 from konova.sub_settings.lanis_settings import DEFAULT_SRID_RLP
+from konova.tasks import celery_check_for_geometry_conflicts
 from konova.utils.wfs.spatial import ParcelWFSFetcher
 
 
@@ -28,7 +29,7 @@ class Geometry(BaseResource):
 
     def save(self, *args, **kwargs):
         super().save(*args, **kwargs)
-        self.check_for_conflicts()
+        celery_check_for_geometry_conflicts.delay(self.id)
 
     def check_for_conflicts(self):
         """ Checks for new geometry overlaps