rename Prtree to Print_tree

Makefile.in

@@ -92,7 +92,7 @@ LIBGENERATED = src/util/rc.ml \
 	       src/driver/driver_parser.mli src/driver/driver_parser.ml \
 	       src/driver/driver_parser.output src/driver/driver_lexer.ml
 
-LIB_UTIL = pp loc prtree hashweak util hashcons sysutil rc
+LIB_UTIL = pp loc print_tree hashweak util hashcons sysutil rc
 
 LIB_CORE = ident ty term pattern decl theory task pretty trans env
 

src/core/pretty.ml

@@ -387,6 +387,6 @@ module NsTree = struct
 end
 
 let print_namespace fmt name ns =
-  let module P = Prtree.Make(NsTree) in
+  let module P = Print_tree.Make(NsTree) in
   fprintf fmt "@[<hov>%a@]@." P.print (NsTree.Namespace (name, ns))