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.

5 files changed, 6 insertions, 7 deletions

diff --git a/perl/t/verifier/basic.t b/perl/t/verifier/basic.t
index be3c427..3ee71d6 100755
--- a/perl/t/verifier/basic.t
+++ b/perl/t/verifier/basic.t
@@ -3,10 +3,10 @@
 # Tests for the basic wallet ACL verifiers.
 #
 # Written by Russ Allbery <eagle@eyrie.org>
-# Copyright 2007, 2008, 2010, 2014
+# Copyright 2007-2008, 2010, 2014
 #     The Board of Trustees of the Leland Stanford Junior University
 #
-# See LICENSE for licensing terms.
+# SPDX-License-Identifier: MIT
 
 use strict;
 use warnings;
diff --git a/perl/t/verifier/external.t b/perl/t/verifier/external.t
index d1438de..2b725bd 100755
--- a/perl/t/verifier/external.t
+++ b/perl/t/verifier/external.t
@@ -2,10 +2,9 @@
 #
 # Tests for the external wallet ACL verifier.
 #
-# Written by Russ Allbery <eagle@eyrie.org>
 # Copyright 2016 Russ Allbery <eagle@eyrie.org>
 #
-# See LICENSE for licensing terms.
+# SPDX-License-Identifier: MIT
 
 use strict;
 use warnings;
diff --git a/perl/t/verifier/ldap-attr.t b/perl/t/verifier/ldap-attr.t
index 3665edb..321822d 100755
--- a/perl/t/verifier/ldap-attr.t
+++ b/perl/t/verifier/ldap-attr.t
@@ -10,7 +10,7 @@
 # Copyright 2012-2014
 #     The Board of Trustees of the Leland Stanford Junior University
 #
-# See LICENSE for licensing terms.
+# SPDX-License-Identifier: MIT
 
 use strict;
 use warnings;
diff --git a/perl/t/verifier/nested.t b/perl/t/verifier/nested.t
index ec7ce40..a975ea3 100755
--- a/perl/t/verifier/nested.t
+++ b/perl/t/verifier/nested.t
@@ -6,7 +6,7 @@
 # Copyright 2015
 #     The Board of Trustees of the Leland Stanford Junior University
 #
-# See LICENSE for licensing terms.
+# SPDX-License-Identifier: MIT
 
 use strict;
 use warnings;
diff --git a/perl/t/verifier/netdb.t b/perl/t/verifier/netdb.t
index 200fc9e..0f3e2d4 100755
--- a/perl/t/verifier/netdb.t
+++ b/perl/t/verifier/netdb.t
@@ -11,7 +11,7 @@
 # Copyright 2008, 2014
 #     The Board of Trustees of the Leland Stanford Junior University
 #
-# See LICENSE for licensing terms.
+# SPDX-License-Identifier: MIT
 
 use strict;
 use warnings;