use markup.ML earlier;

--- a/src/Pure/General/ROOT.ML	Sat Jul 07 18:39:15 2007 +0200
+++ b/src/Pure/General/ROOT.ML	Sat Jul 07 18:39:16 2007 +0200
@@ -11,6 +11,7 @@
 use "graph.ML";
 use "balanced_tree.ML";
 use "output.ML";
+use "markup.ML";
 use "heap.ML";
 use "scan.ML";
 use "source.ML";
@@ -19,7 +20,6 @@
 use "name_space.ML";
 use "seq.ML";
 use "susp.ML";
-use "markup.ML";
 use "position.ML";
 use "path.ML";
 use "url.ML";