Add ability to create bans from reports

This is done in the admin view and opens a new iframed window. The ban
form is pretty barebones and doesn't have full functionality yet, but
that is coming.

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

board/models.py

@@ -304,7 +304,7 @@ class RangeBan(BanCommon):
 
 class Ban(BanCommon):
     # IP address of the ban
-    ip = models.GenericIPAddressField(unique=True)
+    ip = models.GenericIPAddressField()
 
     def __str__(self):
         return f"Ban for {self.ip}"