Don't install COPYINGs

Also, didn't need to specify COPYING, since it's one Automake looks for
anyway.
Fix up post-install/uninstall target

Simpler messaging and don't update desktop database, which was causing
make distcheck to fail.  From reading the manpage, it doesn't sound
necessary anyway, since 3omns isn't handling MIME types.
Add news and bump version for release