Add SPDX-License-Identifier headers

Add SPDX-License-Identifier headers to all substantial source files.
Collapse copyright years.  Add some Emacs configuration for files
where the copyright notice is at the end.  Add a test that every
file has SPDX-License-Identifier.

1 files changed, 2 insertions, 2 deletions

diff --git a/perl/t/policy/stanford.t b/perl/t/policy/stanford.t
index d2727c8..f7b2f16 100755
--- a/perl/t/policy/stanford.t
+++ b/perl/t/policy/stanford.t
@@ -7,10 +7,10 @@
 # behavior at Stanford.
 #
 # Written by Russ Allbery <eagle@eyrie.org>
-# Copyright 2013, 2014
+# Copyright 2013-2014
 #     The Board of Trustees of the Leland Stanford Junior University
 #
-# See LICENSE for licensing terms.
+# SPDX-License-Identifier: MIT
 
 use 5.008;
 use strict;