Currently, MediaWiki's parser.php contains the special function magicRFC(),
which transforms raw text containing 'RFC' followed by a number into a link
specified by MediaWiki:Rfcurl.
This complicates parsing for a relatively rare case, and should be removed.
The functionality could be replaced by the existing RFC InterWiki map entry.
This would require a substitution script to be run across existing databases to
update current links.