Move mantemp.el to obsolete/

* lisp/progmodes/mantemp.el: Move to obsolete/. (bug#34789)
* doc/emacs/ack.texi (Acknowledgments): Remove obsolete library
mantemp.el.

doc/emacs/ack.texi

@@ -502,10 +502,6 @@ expansion package.
 Tassilo Horn wrote DocView mode, allowing viewing of PDF, PostScript and
 DVI documents.
 
-@item
-Tom Houlder wrote @file{mantemp.el}, which generates manual C@t{++}
-template instantiations.
-
 @item
 Joakim Hove wrote @file{html2text.el}, a html to plain text converter.
 

etc/TODO

@@ -560,9 +560,8 @@ from the emacsclient process.
   snmp-mode [?], soundex [should be interactive?], strokes [start from
   the web page], talk, thingatpt [interactive functions?], type-break,
   vcursor, xscheme, zone-mode [?], mlconvert [?], iso-cvt,
-  feedmail [?], uce, gametree, page-ext,
-  refbib, refer, scribe, texinfo, underline,
-  cmacexp, hideif, mantemp [obsolete?], pcomplete, xml,
+  feedmail [?], uce, gametree, page-ext, refbib, refer, scribe,
+  texinfo, underline, cmacexp, hideif, pcomplete, xml,
   cvs-status (should be described in PCL-CVS manual); other progmodes,
   probably in separate manual.
 

lisp/obsolete/mantemp.el

@@ -5,6 +5,7 @@
 ;; Author: Tom Houlder <thoulder@icor.fr>
 ;; Created: 10 Dec 1996
 ;; Keywords: g++, templates
+;; Obsolete-since: 27.1
 
 ;; This file is part of GNU Emacs.
 
@@ -23,6 +24,9 @@
 
 ;;; Commentary:
 
+;; This file is obsolete.  For more information, see:
+;; https://debbugs.gnu.org/34789
+
 ;; The following is a typical error message from g++ using STL (here
 ;; with split lines):
 ;;