Add bumplock to post modify form, and add set_bump permission

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

board/models.py

@@ -119,7 +119,10 @@ class Post(models.Model):
     image_height = models.IntegerField(null=True)
 
     class Meta:
-        permissions = [("set_sticky", "Can sticky post")]
+        permissions = [
+            ("set_sticky", "Can sticky post"),
+            ("set_bump", "Can bumplock post"),
+        ]
 
     def save(self, *args, **kwargs):
         if self.image: