Add post modify view

This allows moderators to modify posts (add sticky, etc).

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

board/models.py

@@ -68,7 +68,7 @@ class Board(models.Model):
         return self.max_pages * self.threads_per_page
 
     def prune_threads(self):
-        to_remove = self.threads.order_by("-last_bump")[self.max_threads :]
+        to_remove = self.threads.order_by("-sticky", "-last_bump")[self.max_threads :]
         for thread in to_remove:
             thread.delete()
 
@@ -93,6 +93,8 @@ class Post(models.Model):
     ip = models.GenericIPAddressField()
     # Capcode
     capcode = models.ForeignKey("Capcode", null=True, blank=True, on_delete=SET_NULL)
+    # Post is stickied
+    sticky = models.BooleanField(default=False, blank=True)
     # Creation time
     created = models.DateTimeField(auto_now_add=True)
     # Last bump time
@@ -116,6 +118,9 @@ class Post(models.Model):
     image_width = models.IntegerField(null=True)
     image_height = models.IntegerField(null=True)
 
+    class Meta:
+        permissions = [("set_sticky", "Can sticky post")]
+
     def save(self, *args, **kwargs):
         if self.image:
             self.original_image_name = Path(self.image.name).parts[-1]