Copyright updates

Copyright updates

With Dan Nicholson's permission (via email), update his copyright and
license statements to the standard X.Org boilerplate MIT license, as
both myself and Ran have been using.

Clean up my copyright declarations (in some cases to correct ownership),
and add copyright/license statements from myself and/or Ran where
appropriate.

Signed-off-by: Daniel Stone <daniel@fooishbar.org>