link changeset comments into db model for cascade deletes

rhodecode/model/db.py

@@ -568,9 +568,10 b' class Repository(Base, BaseModel):'
     followers = relationship('UserFollowing', primaryjoin='UserFollowing.follows_repo_id==Repository.repo_id', cascade='all')
 
     logs = relationship('UserLog')
+    comments = relationship('ChangesetComment')
 
     def __unicode__(self):
-        return u"<%s('%s:%s')>" % (self.__class__.__name__,self.repo_id,
+        return u"<%s('%s:%s')>" % (self.__class__.__name__, self.repo_id,
                                    self.repo_name)
 
     @classmethod