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, 7 insertions, 1 deletions

diff --git a/contrib/wallet-unknown-hosts b/contrib/wallet-unknown-hosts
index 50b5a04..adf7b27 100755
--- a/contrib/wallet-unknown-hosts
+++ b/contrib/wallet-unknown-hosts
@@ -190,7 +190,7 @@ if ($command eq 'check') {
 
 =for stopwords
 ACL API CNAME DNS IP env keytab keytabs timestamp MERCHANTABILITY
-NONINFRINGEMENT sublicense Allbery
+NONINFRINGEMENT sublicense Allbery SPDX-License-Identifier MIT
 
 =head1 NAME
 
@@ -282,4 +282,10 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 DEALINGS IN THE SOFTWARE.
 
+SPDX-License-Identifier: MIT
+
 =cut
+
+# Local Variables:
+# copyright-at-end-flag: t
+# End: