Update some copyright years.
-rw-r--r-- 226 .gitignore
-rw-r--r-- 717 Makefile.am
-rw-r--r-- 337 README
-rw-r--r-- 507 WTFPL2
-rw-r--r-- 81 atlocal.in
-rw-r--r-- 743 configure.ac
drwxr-xr-x - m4
drwxr-xr-x - scripts
drwxr-xr-x - snippet
drwxr-xr-x - src
drwxr-xr-x - t
drwxr-xr-x - tests
-rw-r--r-- 1463 testsuite.at