We linkify these in the WWW UI, and will support them in other
places. These URL schemes may end up being stored in
external/detached indices for indexing non-git-based mail
stores.
1036 => 'Standard for Interchange of USENET Messages',
5536 => 'Netnews Article Format',
5537 => 'Netnews Architecture and Protocols',
+ 1738 => 'Uniform resource locators',
+ 5092 => 'IMAP URL scheme',
+ 5538 => 'NNTP URI schemes',
6048 => 'NNTP additions to LIST command (TODO)',
8054 => 'NNTP compression',
4642 => 'NNTP TLS',