Revert "Prevent creating duplicate revisions on event"

Apparently it was too strong at preventing dupes...

This reverts commit cce0ad0f9f.

# Conflicts:
#	RIGS/models.py

RIGS/models.py

@@ -281,7 +281,7 @@ class EventManager(models.Manager):
         return event_count
 
 
-@reversion.register(follow=['items'])#, ignore_duplicates=True)  # TODO Would be better to find why duplicates are created...
+@reversion.register(follow=['items'])
 class Event(models.Model, RevisionMixin):
     # Done to make it much nicer on the database
     PROVISIONAL = 0
@@ -533,8 +533,6 @@ class EventAuthorisation(models.Model, RevisionMixin):
     amount = models.DecimalField(max_digits=10, decimal_places=2, verbose_name="authorisation amount")
     sent_by = models.ForeignKey('Profile', on_delete=models.CASCADE)
 
-    #reversion_perm = 'RIGS.view_eventauthorisation'
-
     def get_absolute_url(self):
         return reverse_lazy('event_detail', kwargs={'pk': self.event.pk})