Add points of interest

Do a bunch of refactoring in the process.  Current display on homepage
is a little shonky but that can be improved when there is something
using it.

apps/map/models.py

@@ -1015,6 +1015,14 @@ class CaseStudy(models.Model):
 
 
 
+
+class PointOfInterestQuerySet(models.QuerySet):
+    def approved(self):
+        return self.filter(
+            approved=True
+        )
+
+
 class PointOfInterest(models.Model):
     class Meta:
         verbose_name_plural = 'points of interest'
@@ -1022,6 +1030,8 @@ class PointOfInterest(models.Model):
     def __str__(self):
         return self.title
 
+    objects = PointOfInterestQuerySet.as_manager()
+
     author = models.ForeignKey(
             User,
             models.SET_NULL,