implemented a naive approach to stacking analysis via StackedUpperLimitView

urls.py

@@ -1,10 +1,19 @@
 # uplim/urls.py
 
 from django.urls import path
-from .views import PixelAggregateView, UpperLimitView  # , PixelDetailView
+from .views import (
+    PixelAggregateView,
+    UpperLimitView,
+    StackedUpperLimitView,
+)  # , PixelDetailView
 
 urlpatterns = [
     # path('pixel/<int:hpid>/', PixelDetailView.as_view(), name='pixel-detail'),
     path("pixel-aggregate/", PixelAggregateView.as_view(), name="pixel-aggregate"),
     path("upper-limit/", UpperLimitView.as_view(), name="upper-limit"),
+    path(
+        "stacked-upper-limit/",
+        StackedUpperLimitView.as_view(),
+        name="stacked-upper-limit",
+    ),
 ]