Revert "make python3 default"
Revert "make python3 default"

This reverts commit a790d8cdb9705743e05eec4127034740e9b48a13.

tomhughes/mapnik,lightmare/mapnik,naturalatlas/mapnik,naturalatlas/mapnik,tomhughes/mapnik,lightmare/mapnik,tomhughes/mapnik,lightmare/mapnik,mapnik/mapnik,mapnik/mapnik,mapnik/mapnik,mapnik/mapnik,tomhughes/mapnik,naturalatlas/mapnik,naturalatlas/mapnik,lightmare/mapnik