License for the tzdata information

[Paul Koning]

> On Tue, 28 Apr 2009, Olson, Arthur David (NIH/NCI) [E] wrote:
> 
> > There's no license.
> 
> Everything has a license. No license (in the US) means that someone
> (you?)
> retains all rights.

Not necessarily.  It might be a work of the US Government (consider the
distribution site, and the name of the organization Arthur is associated
with).  If so, it is in the public domain.
 
> Obviously, I know you don't _mean_ that, so it'd be good to include an
> explicit license. It seems like a BSD license would work well.

Agreed.  And if it's in the public domain, it would be good for that to
be stated explicitly.

	paul