Fix bug with quantization error estimation.
Fix bug with quantization error estimation.

whoinlee/topojson,lyhpcha/topojson,maxogden/topojson,btahir/topojson,koshlan/topojson,AlpinHologramm/topojson,hcxiong/topojson,tsl3su/WorldMap_Choropleth,mbostock/topojson,studiowangfei/topojson,ststeiger/topojson,youprofit/topojson,ongerit/topojson