Iterator benchmark

[Boudewijn Rempt]

On Wed, 10 Jun 2009, Kai-Uwe Behrmann wrote:

> So you implementation appears to run ~10 times faster than mine :-)
> which is not good for per pixel access through Oyranos :-(

To do a real comparison, we should also do a call to lcms, I think. Because
our tests don't even hit lcms or even pigmentcms at the moment. So the
differences don't have to be _that_ dramatic :-)

Boudewijn