[Config change] Upload ratelimit for non-trusted uploaders (#384)

* Implement upload ratelimit for non-trusted uploaders

Users may upload X torrents in Y minutes after which they
will have to wait Z minutes between uploads.

* Show torrent period count when ratelimited

* Only ratelimit new accounts

nyaa/forms.py

@@ -323,6 +323,8 @@ class UploadForm(FlaskForm):
         Length(max=10 * 1024, message='Description must be at most %(max)d characters long.')
     ])
 
+    ratelimit = HiddenField()
+
     def validate_torrent_file(form, field):
         # Decode and ensure data is bencoded data
         try: