[Tilesathome] Lowzoom approaches. Feedback appreciated.

[Alan Millar]

> use of cairo was pretty primitive anyway, I think I'll have a look at
> replacing that with the Python Image Library (PIL) which works similarly
> but has much more image manipulation possibilities. I only used cairo as
> that happened to be installed on the server while PIL is not (yet).
> Allan, do you want to have a go at it? I can always try to answer/help. If

Yes, I do.  I'm really close to having my local tangho server test
environment working.

- Alan