Disable handling of "bare" links by the creole plugin.

This change needs libtext-wikicreole-perl (>= 0.05-2).
Also removing custom link function, there's no need for it -
if it is not defined, the unmodified markup will be returned.

IkiWiki/Plugin/creole.pm

@@ -19,8 +19,8 @@ sub htmlize (@) { #{{{
 	return $content if $@;
 
 	# don't parse WikiLinks, ikiwiki already does
-	creole_link(sub { return shift });
 	creole_customlinks();
+	creole_custombarelinks();
 
 	return creole_parse($content);
 } # }}}