Make things in contrib directory installable.

Make things in contrib directory installable.

* Makefile (SUBDIRS): Add contrib.
  (all): Add contrib.
  (contrib): New target that compiles things in the contrib directory.
  (install-bin): Add contrib.  Install things in the contrib directory.
  Also install uncompiled things in the experimental directory.

* contrib/Makefile: New Makefile for the contrib directory.

* contrib/httpd.el (httpd-start): Fix compiler warnings.

* debian/emacsen-install: Compile files in contrib directory in addition
  to the normal fare.  Thanks to Junichi Uekawa for the suggestion.

* debian/emacsen-startup: Add contrib directory to load-path.

* experimental/Makefile (test): Remove target.
  (install-uncompiled): New target that installs uncompiled files.

* lisp/muse.el: Set version to 3.02.90 (3.03 RC1).
  (muse-update-file-extension): Fix a warning that occurred when doing
  batch publishing.
git-archimport-id: mwolson@gnu.org--2006/muse--main--1.0--patch-96