cache tidy and move settings into parser

core/models/caves.py

@@ -585,7 +585,7 @@ class QM(TroggleModel):
         
 class PersonTrip(TroggleModel):
     """Single Person going on a trip, which may or may not be written up.
-    It accounts for different T/U for people in same logbook entry.
+    It could account for different T/U for people in same logbook entry.
     """
     personexpedition = models.ForeignKey("PersonExpedition",null=True,on_delete=models.CASCADE)
     time_underground = models.FloatField(help_text="In decimal hours")

core/views/logbooks.py

@@ -215,6 +215,7 @@ def logbookentry(request, date, slug):
          
             this_logbookentry=this_logbookentry[0]
             # This is the only page that uses presontrip_next and persontrip_prev
+            # and it is calculated on the fly in the model 
             return render(request, 'logbookentry.html', 
                 {'logbookentry': this_logbookentry, 'trips': trips, 'svxothers': svxothers, 'wallets': wallets})
     else: