mapnik upstream now supports 1) detecting spatialite type geometries and detecting the primary key (key_field), so drop the brittle code in millstone that did lookahead inspection
mapnik upstream now supports 1) detecting spatialite type geometries and detecting the primary key (key_field), so drop the brittle code in millstone that did lookahead inspection

CartoDB/millstone,BHare1985/millstone,mapbox/millstone