Split off features about coding-system from poem.

diff --git a/pces.el b/pces.el
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+++ b/pces.el
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+;;; pces.el --- Portable Character Encoding Scheme (coding-system) features
+
+;; Copyright (C) 1998,1999 Free Software Foundation, Inc.
+
+;; Author: MORIOKA Tomohiko <tomo@m17n.org>
+;; Keywords: coding-system, emulation, compatibility, Mule
+
+;; This file is part of APEL (A Portable Emacs Library).
+
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the GNU General Public License as
+;; published by the Free Software Foundation; either version 2, or (at
+;; your option) any later version.
+
+;; This program is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;; General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Code:
+
+(require 'poe)
+
+(eval-and-compile
+  (unless (fboundp 'open-network-stream)
+    (require 'tcp)))
+
+(cond ((and (featurep 'xemacs)
+           (featurep 'file-coding))
+       (require 'pces-xfc)
+       )
+      ((featurep 'mule)
+       (if (>= emacs-major-version 20)
+          (require 'pces-e20)
+        ;; for MULE 1.* and 2.*
+        (require 'pces-om)
+        ))
+      ((boundp 'NEMACS)
+       ;; for Nemacs and Nepoch
+       (require 'pces-nemacs)
+       )
+      (t
+       (require 'pces-raw)
+       ))
+
+        
+;;; @ end
+;;;
+
+(provide 'pces)
+
+;;; pces.el ends here