Update copyright for 2016

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 48c9f2889a4ad25a771d13b88f2778a306f2d970
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-01-02T19:19:48Z
Releases: 9.6.0
Update copyright for 2016

On closer inspection, the reason copyright.pl was missing files is
that it is looking for 'Copyright (c)' and they had 'Copyright (C)'.
Fix that, and update a couple more that grepping for that revealed.

Files