Revert "Fix a bug with links to pages whose names contained colons."

This reverts commit e25c3a0a7c.

I didn't think that through far enough; beautify_url may be called on full
urls, which don't start with "/"!

Conflicts:

	debian/changelog

IkiWiki.pm

@@ -539,12 +539,7 @@ sub beautify_url ($) { #{{{
 	if ($config{usedirs}) {
 		$url =~ s!/index.$config{htmlext}$!/!;
 	}
-
-	# Ensure url is not an empty link, and
-	# if it's relative, make that explicit to avoid colon confusion.
-	if ($url !~ /\//) {
-		$url="./$url";
-	}
+	$url =~ s!^$!./!; # Browsers don't like empty links...
 
 	return $url;
 } #}}}