More cleanup and modernisation

core/views_survex.py

@@ -257,7 +257,7 @@ def identifycavedircontents(gcavedir):
 # perhaps should use the database and have a reload button for it
 def survexcaveslist(request):
     cavesdir = os.path.join(settings.SURVEX_DATA, "caves")
-    cavesdircontents = { }
+    #cavesdircontents = { }
     
     onefilecaves = [ ]
     multifilecaves = [ ]