Everyone else was using gzip. On the latest downloads many of them
are using bzip2, (I think everyone using scons)
So I decided to update make release so that everyone is using
gzip2. I don't mean to step on anyones toes, I know at least some of
the platform maintainers do not use make though so feel free to change
it back and or to something different for your platform.
While I was at it I also changed default path of OPENEXR to /usr on linux.
Was suggested on mailing list by Matt.
(I'm pretty sure the linux maintainer is using scons)
Kent