Replaced "init_thy_reader" by "set_parser".

--- a/src/ZF/thy_syntax.ML	Wed Aug 06 00:45:09 1997 +0200
+++ b/src/ZF/thy_syntax.ML	Wed Aug 06 00:47:20 1997 +0200
@@ -151,4 +151,4 @@
 
 
 structure ThySyn = ThySynFun(ThySynData);
-init_thy_reader ();
+set_parser ThySyn.parse;