Update copyright notices and get rid of ranges

The script used to make these changes can be found at:

   https://gist.github.com/Deiz/32322020f76d23e2bf8f

testcases/complete-run.pl

@@ -1,6 +1,6 @@
 #!/usr/bin/env perl
 # vim:ts=4:sw=4:expandtab
-# © 2010-2012 Michael Stapelberg and contributors
+# © 2010 Michael Stapelberg and contributors
 package complete_run;
 use strict;
 use warnings;