Users may only report a post once per IP address.

If a user *really* doesn't like a post, they may try to report it
multiple times. Users may now only report a single post once per IP
address.

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

board/models.py

@@ -281,6 +281,11 @@ class Report(models.Model):
         they are abusing the system.
     """
 
+    class Meta:
+        unique_together = [
+            ["record", "ip"],
+        ]
+
     # The report that was made by this user
     record = models.ForeignKey("ReportRecord", on_delete=models.CASCADE)
     # Reason for this report