tiny tidyings

core/models.py

@@ -25,10 +25,15 @@ import troggle.core.models_survex
 
 """This file declares TroggleModel which inherits from django.db.models.Model 
 All TroggleModel subclasses inherit persistence in the django relational database. This is known as
-the django Object Relkational Mapping (ORM).
+the django Object Relational Mapping (ORM).
 There are more subclasses define in models_caves.py models_survex.py etc.
 """
 
+# This variable is a dictionary holding gloablly visible indexes and cache functions.
+# It is a Global Object, see https://python-patterns.guide/python/module-globals/
+# troggle.models.TROG
+TROG = {}
+
 def get_process_memory():
     usage=resource.getrusage(resource.RUSAGE_SELF)
     return usage[2]/1024.0