removed obsolete pretty printers for Theory.theory, Sign.sg;
added pretty printer for Context.theory (long form of output);

--- a/src/Pure/install_pp.ML	Fri Jun 17 18:33:22 2005 +0200
+++ b/src/Pure/install_pp.ML	Fri Jun 17 18:33:23 2005 +0200
@@ -1,13 +1,12 @@
 (*  Title:      Pure/install_pp.ML
     ID:         $Id$
 
-Set up automatic toplevel pretty printing.
+ML toplevel pretty printing.
 *)
 
-install_pp (make_pp ["Theory", "theory"] Display.pprint_theory);
 install_pp (make_pp ["Thm", "thm"] Display.pprint_thm);
 install_pp (make_pp ["Thm", "cterm"] Display.pprint_cterm);
 install_pp (make_pp ["Thm", "ctyp"] Display.pprint_ctyp);
-install_pp (make_pp ["Sign", "sg"] Sign.pprint_sg);
+install_pp (make_pp ["Context", "theory"] Context.pprint_thy);
 install_pp (make_pp ["Syntax", "ast"] Syntax.pprint_ast);
 install_pp (make_pp ["typ"] Syntax.simple_pprint_typ);