proj_transform test: also check that transform succeeded
proj_transform test: also check that transform succeeded

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