Add thread locking and permissions

Mods can lock threads from replying now. Yay!

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

board/models.py

@@ -93,8 +93,10 @@ class Post(models.Model):
     ip = models.GenericIPAddressField()
     # Capcode
     capcode = models.ForeignKey("Capcode", null=True, blank=True, on_delete=SET_NULL)
-    # Post is stickied
+    # Post is stickied - it remains at the top of the bump list.
     sticky = models.BooleanField(default=False, blank=True)
+    # Post is locked - nobody can post in it.
+    lock = models.BooleanField(default=False, blank=True)
     # Creation time
     created = models.DateTimeField(auto_now_add=True)
     # Last bump time
@@ -122,6 +124,7 @@ class Post(models.Model):
         permissions = [
             ("set_sticky", "Can sticky post"),
             ("set_bump", "Can bumplock post"),
+            ("set_lock", "Can lock post"),
         ]
 
     def save(self, *args, **kwargs):