pamhyr: Add just-in-time database geometry loading.

src/Model/Tools/PamhyrList.py

@@ -59,12 +59,12 @@ class PamhyrModelList(SQLSubModel):
     # MODEL METHOD #
     ################
 
-    def __len__(self):
-        return len(self._lst)
-
     @property
     def lst(self):
-        return self._lst.copy()
+        return self._lst
+
+    def __len__(self):
+        return len(self.lst)
 
     def get(self, row):
         return self._lst[row]