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, 1 insertions, 1 deletions

diff --git a/tests/server/admin-t b/tests/server/admin-t
index 8fde012..4d6670b 100755
--- a/tests/server/admin-t
+++ b/tests/server/admin-t
@@ -7,7 +7,7 @@
 # Copyright 2008-2011, 2014
 #     The Board of Trustees of the Leland Stanford Junior University
 #
-# See LICENSE for licensing terms.
+# SPDX-License-Identifier: MIT
 
 use strict;
 use Test::More tests => 42;