[Carto] Temporary SVN Repository for Carto Project Work

[Tyler Mitchell (OSGeo)]

> Hopefully this will make it easier to do things like share source code,
> discuss file formats, provide sample data for engine implementations,
> than it would be using e-mail. :] Perhaps we can move things to an OSGeo
> labs project if we keep making progress. I’ll leave that up to Tyler.

There's no problem using the general OSGeo SVN for this whenever.