View: Tools: Add tree model.

src/Model/Tools/PamhyrDB.py

@@ -185,6 +185,13 @@ class SQLSubModel(PamhyrID):
         else:
             self._owner_scenario = owner_scenario
 
+    def __str__(self):
+        t = type(self)
+        return (
+            f"'{t.__module__}.{t.__name__}" +
+            f"@{self._pamhyr_id}.{self._owner_scenario}'"
+        )
+
     def must_be_saved(self):
         """Return True if this object MUST be save in the save file.