Geometry simplification

* simplifies geometries on SimpleGeomForm if threshold GEOM_MAX_VERTICES has been exceeded
    * geometry is iteratively simplified to find a proper tolerance value which satisfies the GEOM_MAX_VERTICES threshold

ema/views/ema.py

@@ -23,7 +23,7 @@ from konova.forms.modals import RemoveModalForm
 from konova.settings import DEFAULT_GROUP, ZB_GROUP, ETS_GROUP
 from konova.sub_settings.context_settings import TAB_TITLE_IDENTIFIER
 from konova.utils.message_templates import RECORDED_BLOCKS_EDIT, IDENTIFIER_REPLACED, FORM_INVALID, \
-    DO_NOT_FORGET_TO_SHARE
+    DO_NOT_FORGET_TO_SHARE, GEOMETRY_SIMPLIFIED
 from konova.utils.user_checks import in_group
 
 
@@ -84,6 +84,12 @@ def new_view(request: HttpRequest):
                     )
                 )
             messages.success(request, _("EMA {} added").format(ema.identifier))
+            if geom_form.geometry_simplified:
+                messages.info(
+                    request,
+                    GEOMETRY_SIMPLIFIED
+                )
+
             return redirect("ema:detail", id=ema.id)
         else:
             messages.error(request, FORM_INVALID, extra_tags="danger",)
@@ -208,6 +214,11 @@ def edit_view(request: HttpRequest, id: str):
             # The data form takes the geom form for processing, as well as the performing user
             ema = data_form.save(request.user, geom_form)
             messages.success(request, _("EMA {} edited").format(ema.identifier))
+            if geom_form.geometry_simplified:
+                messages.info(
+                    request,
+                    GEOMETRY_SIMPLIFIED
+                )
             return redirect("ema:detail", id=ema.id)
         else:
             messages.error(request, FORM_INVALID, extra_tags="danger",)